Merge branch 'dev' of github.com:Tria-plc/edr-platform into freight_feature/usermanagement

apps/edr-freight-api/src/modules/billing/billing.controller.ts

@@ -1,4 +1,5 @@
 import {
+  BadRequestException,
   Body,
   Controller,
   Get,
@@ -29,6 +30,7 @@ import { actorLabel } from "../warehouses/current-actor.util";
 import { UserTradeAccessService } from "../user-trade-access/user-trade-access.service";
 import { BillingService } from "./billing.service";
 import { FilterInvoiceDto } from "./dto/filter-invoice.dto";
+import { IssueMemoDto } from "./dto/issue-memo.dto";
 
 @ApiTags("billing")
 @Controller("billing")
@@ -38,6 +40,7 @@ import { FilterInvoiceDto } from "./dto/filter-invoice.dto";
   FREIGHT_PERMS.invoices.view,
   FREIGHT_PERMS.invoices.export,
   FREIGHT_PERMS.invoices.confirmOffline,
+  FREIGHT_PERMS.invoices.memoIssue,
 ])
 @ApiBearerAuth()
 export class BillingController {
@@ -116,11 +119,31 @@ export class BillingController {
     });
   }
 
+  @Post("invoices/:id/memo")
+  @BookingStaff(FREIGHT_PERMS.invoices.memoIssue)
+  @ApiOperation({
+    summary:
+      "Issue a credit or debit memo against a registered invoice (MoR DEB/CRE). Filing-equivalent — the auto-submit sweep picks it up like any other issued invoice.",
+  })
+  issueMemo(@Param("id", ParseUUIDPipe) id: string, @Body() dto: IssueMemoDto) {
+    return this.billingService.issueMemo(id, dto);
+  }
+
   @Get("invoices/:id/document")
   @BookingStaff(FREIGHT_PERMS.invoices.export)
-  @ApiOperation({ summary: "Download the sealed invoice PDF" })
-  async document(@Param("id", ParseUUIDPipe) id: string, @Res() res: Response) {
-    const { filename, buffer } = await this.billingService.document(id);
+  @ApiOperation({
+    summary:
+      'Download the sealed invoice PDF. ?format=a4 (default) or ?format=thermal for the 80mm thermal layout (ADD-P001).',
+  })
+  async document(
+    @Param("id", ParseUUIDPipe) id: string,
+    @Query("format") format: string | undefined,
+    @Res() res: Response,
+  ) {
+    if (format !== undefined && format !== "a4" && format !== "thermal") {
+      throw new BadRequestException(`Unsupported format "${format}" — use "a4" or "thermal".`);
+    }
+    const { filename, buffer } = await this.billingService.document(id, format === "thermal" ? "thermal" : "a4");
     sendPdf(res, filename, buffer);
   }
 

apps/edr-freight-api/src/modules/billing/billing.service.spec.ts

@@ -119,6 +119,159 @@ describe("BillingService.generateInvoice", () => {
   });
 });
 
+describe("BillingService.issueMemo", () => {
+  const ORIGINAL_ID = "original-invoice-1";
+
+  function originalInvoice(overrides: Record<string, unknown> = {}) {
+    return {
+      id: ORIGINAL_ID,
+      invoiceNumber: "INV-20260807-00042",
+      eimsIrn: "irn-value",
+      eimsDocumentType: "INV",
+      eimsStatus: "REGISTERED",
+      source: Freight.InvoiceSource.Booking,
+      sourceId: "booking-1",
+      companyId: "company-1",
+      companyProfileId: "profile-1",
+      shippingLineCompanyId: null,
+      currency: "ETB",
+      totalAmount: 1500,
+      lines: [
+        { chargeType: "RAIL_FREIGHT", description: "Rail freight", quantity: 2, unitRate: 500, amount: 1000, currency: "ETB", metadata: null },
+        { chargeType: "HAZARD_SURCHARGE", description: "Hazard surcharge", quantity: 2, unitRate: 250, amount: 500, currency: "ETB", metadata: null },
+      ],
+      ...overrides,
+    };
+  }
+
+  function build(original: ReturnType<typeof originalInvoice>) {
+    const savedLines: unknown[] = [];
+    const manager = makeManager(savedLines);
+    const dataSource = {
+      transaction: jest.fn().mockImplementation((cb: (mg: unknown) => unknown) => cb(manager)),
+      manager,
+    };
+    const invoices = { findById: jest.fn().mockResolvedValue(original) };
+    const invoiceLines = { findAll: jest.fn().mockResolvedValue(original.lines) };
+    const service = new BillingService(
+      dataSource as never,
+      invoices as never,
+      invoiceLines as never,
+      makeEvents() as never,
+      {} as never,
+      {} as never,
+      {} as never,
+      {} as never,
+      { get: () => undefined } as never,
+    );
+    return { service, manager, savedLines };
+  }
+
+  it("creates a settled credit memo copying the original's lines, linked via relatedInvoiceId", async () => {
+    const { service, savedLines } = build(originalInvoice());
+
+    const memo = await service.issueMemo(ORIGINAL_ID, { type: "CRE", reason: "Overbilled freight charge" });
+
+    expect(memo.invoiceNumber).toMatch(/^CRE-\d{8}-00001$/);
+    expect(memo.totalAmount).toBe(1500);
+    expect(memo.status).toBe(Freight.InvoiceStatus.Paid);
+    expect((memo as unknown as Record<string, unknown>).eimsDocumentType).toBe("CRE");
+    expect((memo as unknown as Record<string, unknown>).eimsReason).toBe("Overbilled freight charge");
+    expect((memo as unknown as Record<string, unknown>).relatedInvoiceId).toBe(ORIGINAL_ID);
+    expect((memo as unknown as Record<string, unknown>).paidAmount).toBe(1500);
+    expect((memo as unknown as Record<string, unknown>).balanceAmount).toBe(0);
+    expect(savedLines).toHaveLength(2);
+  });
+
+  it("creates an open, unpaid debit memo — a genuine new receivable, not force-settled", async () => {
+    const { service } = build(originalInvoice());
+
+    const memo = await service.issueMemo(ORIGINAL_ID, { type: "DEB", reason: "Additional handling fee" });
+
+    expect(memo.invoiceNumber).toMatch(/^DEB-\d{8}-00001$/);
+    expect(memo.status).toBe(Freight.InvoiceStatus.Pending);
+    expect(memo.balanceAmount).toBe(1500);
+    expect(memo.paidAmount).toBe(0);
+  });
+
+  it("keys the memo's sourceId to the original invoice's own id, not the original's sourceId", async () => {
+    const { service } = build(originalInvoice());
+
+    const memo = await service.issueMemo(ORIGINAL_ID, { type: "CRE", reason: "test" });
+
+    expect(memo.sourceId).toBe(ORIGINAL_ID);
+    expect(memo.sourceId).not.toBe("booking-1");
+  });
+
+  it("allows a partial memo with explicit lines instead of copying the original", async () => {
+    const { service } = build(originalInvoice());
+
+    const memo = await service.issueMemo(ORIGINAL_ID, {
+      type: "CRE",
+      reason: "Partial credit",
+      lines: [{ chargeType: "RAIL_FREIGHT", quantity: 1, unitRate: 200, amount: 200 }],
+    });
+
+    expect(memo.totalAmount).toBe(200);
+  });
+
+  it("refuses a memo against an invoice never registered with EIMS", async () => {
+    const { service } = build(originalInvoice({ eimsIrn: null }));
+
+    await expect(service.issueMemo(ORIGINAL_ID, { type: "CRE", reason: "x" })).rejects.toMatchObject({
+      response: expect.objectContaining({ code: "EIMS_RELATED_INVOICE_NOT_REGISTERED" }),
+    });
+  });
+
+  it("refuses a memo against a memo", async () => {
+    const { service } = build(originalInvoice({ eimsDocumentType: "CRE" }));
+
+    await expect(service.issueMemo(ORIGINAL_ID, { type: "DEB", reason: "x" })).rejects.toThrow(
+      "cannot issue a memo against a memo",
+    );
+  });
+
+  it("refuses a memo against an EIMS-cancelled invoice", async () => {
+    const { service } = build(originalInvoice({ eimsStatus: "CANCELLED" }));
+
+    await expect(service.issueMemo(ORIGINAL_ID, { type: "CRE", reason: "x" })).rejects.toThrow(
+      "cancelled with EIMS",
+    );
+  });
+
+  it("refuses a credit memo whose total exceeds the original", async () => {
+    const { service } = build(originalInvoice({ totalAmount: 1500 }));
+
+    await expect(
+      service.issueMemo(ORIGINAL_ID, {
+        type: "CRE",
+        reason: "too much",
+        lines: [{ chargeType: "RAIL_FREIGHT", quantity: 1, unitRate: 2000, amount: 2000 }],
+      }),
+    ).rejects.toThrow(/exceeds/);
+  });
+
+  it("does NOT bound a debit memo by the original's total — it is a new charge, not a refund", async () => {
+    const { service } = build(originalInvoice({ totalAmount: 1500 }));
+
+    const memo = await service.issueMemo(ORIGINAL_ID, {
+      type: "DEB",
+      reason: "additional charge",
+      lines: [{ chargeType: "RAIL_FREIGHT", quantity: 1, unitRate: 5000, amount: 5000 }],
+    });
+
+    expect(memo.totalAmount).toBe(5000);
+  });
+
+  it("refuses a blank reason", async () => {
+    const { service } = build(originalInvoice());
+
+    await expect(service.issueMemo(ORIGINAL_ID, { type: "CRE", reason: "   " })).rejects.toThrow(
+      "requires a reason",
+    );
+  });
+});
+
 describe("BillingService.markInvoiceAsPaid", () => {
   it("marks the invoice PAID, stamps amounts/paidAt, links the payment, and emits ${source}.invoice.paid", async () => {
     const open = {
@@ -774,6 +927,7 @@ describe("BillingService.document", () => {
 
   const build = (invoice: Record<string, unknown>) => {
     const render = jest.fn().mockResolvedValue({ filename: "x.pdf", buffer: Buffer.from("") });
+    const renderThermal = jest.fn().mockResolvedValue({ filename: "x-thermal.pdf", buffer: Buffer.from("") });
     const service = new BillingService(
       {} as never,
       { findById: jest.fn().mockResolvedValue(invoice) } as never,
@@ -781,7 +935,7 @@ describe("BillingService.document", () => {
       {} as never,
       {} as never,
       {} as never,
-      { render } as never,
+      { render, renderThermal } as never,
       {} as never,
       {
         get: (key: string) =>
@@ -790,7 +944,7 @@ describe("BillingService.document", () => {
             : undefined,
       } as never, // config
     );
-    return { service, render };
+    return { service, render, renderThermal };
   };
 
   it("adds no EIMS IRN row and no QR for an unregistered invoice", async () => {
@@ -847,4 +1001,24 @@ describe("BillingService.document", () => {
     expect(model.summary).toContainEqual({ label: "EIMS IRN", value: "IRN-123" });
     expect(model.qrImageUrl).toBe("data:image/png;base64,signed-payload");
   });
+
+  it("calls render (not renderThermal) for the default format", async () => {
+    const { service, render, renderThermal } = build(invoiceRow());
+    jest.spyOn(service as never, "toDocumentModel").mockResolvedValue({} as never);
+
+    await service.document("inv-1");
+
+    expect(render).toHaveBeenCalledTimes(1);
+    expect(renderThermal).not.toHaveBeenCalled();
+  });
+
+  it("calls renderThermal (not render) for format 'thermal'", async () => {
+    const { service, render, renderThermal } = build(invoiceRow());
+    jest.spyOn(service as never, "toDocumentModel").mockResolvedValue({} as never);
+
+    await service.document("inv-1", "thermal");
+
+    expect(renderThermal).toHaveBeenCalledTimes(1);
+    expect(render).not.toHaveBeenCalled();
+  });
 });

apps/edr-freight-api/src/modules/billing/billing.service.ts

@@ -18,6 +18,7 @@ import { Booking } from "../bookings/entities/booking.entity";
 import { ShippingLineCompany } from "../shipping-lines/entities/shipping-line-company.entity";
 import { EimsConfig } from "../../config/eims.config";
 import { CompaniesService } from "../companies/companies.service";
+import { EimsInvoiceStatus } from "../eims/eims-registration.types";
 import { FilesService } from "../files/files.service";
 import { applyBookingRefDirectionScope } from "../user-trade-access/trade-scope.util";
 import { PaymentService } from "../payment/payment.service";
@@ -25,6 +26,7 @@ import { InitiateResponseDto, IntentStatusDto } from "../payment/payments.dto";
 import {
   InvoiceDocumentModel,
   InvoiceDocumentService,
+  pngDataUrl,
 } from "./documents/invoice-document.service";
 import { InvoiceLine } from "./entities/invoice-line.entity";
 import { Invoice, InvoicePayment } from "./entities/invoice.entity";
@@ -145,6 +147,18 @@ export interface GenerateInvoiceInput {
   status?: Freight.InvoiceStatus;
 }
 
+/** MoR `DocumentDetails.Type` for a memo — see `EIMS_DOCUMENT_TYPES` in `eims-invoice.mapper.ts`. */
+export type MemoType = "CRE" | "DEB";
+
+/** Everything needed to issue a credit or debit memo against an already-registered invoice. */
+export interface IssueMemoInput {
+  type: MemoType;
+  /** Why the memo was issued — required by MoR as `DocumentDetails.Reason`. */
+  reason: string;
+  /** Omit to copy every line of the original verbatim (a full reversal/charge, the common case). */
+  lines?: InvoiceLineInput[];
+}
+
 /** Payload broadcast on `${source}.invoice.<event>`. */
 export interface InvoiceEventPayload {
   invoiceId: string;
@@ -481,12 +495,20 @@ export class BillingService {
 
   // ── Documents (central PDF) ──────────────────────────────────────────────────
 
-  /** Sealed PDF invoice for any source, rendered by the shared document service. */
-  async document(id: string): Promise<{ filename: string; buffer: Buffer }> {
+  /**
+   * Sealed PDF invoice for any source, rendered by the shared document service. `format`
+   * validation (rejecting anything but `"a4"`/`"thermal"`) is the controller's job — an input
+   * boundary check, not a business rule.
+   */
+  async document(
+    id: string,
+    format: "a4" | "thermal" = "a4",
+  ): Promise<{ filename: string; buffer: Buffer }> {
     const invoice = await this.findById(id);
-    return this.invoiceDocuments.render(
-      await this.toDocumentModel(invoice, "INVOICE"),
-    );
+    const model = await this.toDocumentModel(invoice, "INVOICE");
+    return format === "thermal"
+      ? this.invoiceDocuments.renderThermal(model)
+      : this.invoiceDocuments.render(model);
   }
 
   /** Sealed PDF receipt; available once any payment has been recorded. */
@@ -502,15 +524,6 @@ export class BillingService {
     );
   }
 
-  /**
-   * `Invoice.eimsSignedQr` is already a base64 PNG straight from MoR — confirmed against the
-   * Postman collection's `register` response (`signedQR` decodes to a PNG magic-byte header),
-   * not a payload we encode ourselves. Wrapped in a data URL, nothing more.
-   */
-  private renderEimsQr(signedQr: string): string {
-    return `data:image/png;base64,${signedQr}`;
-  }
-
   /** Route + wagon count summary rows for a booking-sourced invoice; empty for every other source. */
   private async bookingSummaryRows(
     invoice: Invoice,
@@ -626,7 +639,7 @@ export class BillingService {
         currency: l.currency,
       })),
       totals,
-      qrImageUrl: invoice.eimsSignedQr ? this.renderEimsQr(invoice.eimsSignedQr) : null,
+      qrImageUrl: invoice.eimsSignedQr ? pngDataUrl(invoice.eimsSignedQr) : null,
     };
   }
 
@@ -793,11 +806,16 @@ export class BillingService {
 
   // ── Generation ───────────────────────────────────────────────────────────────
 
-  /** `<CODE>-YYYYMMDD-00001` — sequential per day & prefix, within the active transaction. */
-  private nextInvoiceNumber(mg: EntityManager): Promise<string> {
+  /**
+   * `<CODE>-YYYYMMDD-00001` — sequential per day & prefix, within the active transaction. `code`
+   * defaults to `INV`; a memo (`issueMemo`) uses `CRE`/`DEB` instead, which is its own independent
+   * daily sequence (different prefix hashes to a different advisory lock, see
+   * `nextDailyInvoiceNumber`) — not a collision risk with ordinary invoice numbers.
+   */
+  private nextInvoiceNumber(mg: EntityManager, code = "INV"): Promise<string> {
     return nextDailyInvoiceNumber(mg, {
       table: "freight.invoices",
-      code: "INV",
+      code,
     });
   }
 
@@ -820,9 +838,123 @@ export class BillingService {
     return manager ? run(manager) : this.dataSource.transaction(run);
   }
 
+  /**
+   * Issue a credit or debit memo against an already-registered invoice, per MoR's confirmed
+   * DEB/CRE filing mechanism (same `/v1/register` endpoint, `DocumentDetails.Type` + `Reason`,
+   * `ReferenceDetails.RelatedDocument` — see `eims-invoice.mapper.ts`). Reuses `createInvoice`
+   * unchanged: it has no side effects (no events, no notifications, no payment records — every
+   * event in this service fires from `runTransition` on a *transition*, not on create), so a memo
+   * is just an ordinary invoice with three extra columns set.
+   *
+   * `sourceId` is deliberately the *original invoice's own id*, not the original's `sourceId`
+   * (e.g. a booking id): `findPayable`, `expirePayable` and `billQuery` all resolve by
+   * `sourceId` with no `type` filter, so a memo sharing the booking's `sourceId` would be the
+   * newest matching row and could hijack a payer's balance at a CBE teller. An invoice's own
+   * `id` is never a value those lookups are ever queried with, so this isolates a memo from all
+   * of them regardless of its status — no `type`-based exclusion needed anywhere else.
+   *
+   * A credit note is created settled (PAID, balance 0) — nothing is ever collected against it, so
+   * leaving it payable would only add a phantom receivable that no payment flow will ever close.
+   * A debit note genuinely IS a new receivable and is created open/unpaid like any ordinary
+   * invoice (`createInvoice`'s own defaults: PENDING, `balanceAmount = totalAmount`) — it is
+   * findable and collectible through the normal invoice list/detail/payment tooling, safe from
+   * the CBE/booking-linked lookups above for the `sourceId` reason just given.
+   */
+  async issueMemo(
+    originalId: string,
+    input: IssueMemoInput,
+  ): Promise<Invoice & { lines: InvoiceLine[] }> {
+    const reason = input.reason?.trim();
+    if (!reason) {
+      throw new BadRequestException("A memo requires a reason.");
+    }
+
+    const original = await this.findById(originalId);
+    if (!original.eimsIrn) {
+      throw new BadRequestException({
+        code: "EIMS_RELATED_INVOICE_NOT_REGISTERED",
+        message: `Invoice ${original.invoiceNumber} was never registered with EIMS — nothing to reference.`,
+      });
+    }
+    if (original.eimsDocumentType && original.eimsDocumentType !== "INV") {
+      throw new BadRequestException(
+        `Invoice ${original.invoiceNumber} is itself a ${original.eimsDocumentType} — cannot issue a memo against a memo.`,
+      );
+    }
+    if (original.eimsStatus === EimsInvoiceStatus.Cancelled) {
+      throw new BadRequestException(
+        `Invoice ${original.invoiceNumber} was cancelled with EIMS — nothing to adjust.`,
+      );
+    }
+
+    const sourceLines = input.lines?.length ? input.lines : original.lines;
+    const lines: InvoiceLineInput[] = sourceLines.map((l) => ({
+      chargeType: l.chargeType,
+      description: l.description,
+      quantity: Number(l.quantity),
+      unitRate: Number(l.unitRate),
+      amount: Number(l.amount),
+      currency: l.currency,
+      metadata: l.metadata ?? null,
+    }));
+
+    const total = round2(lines.reduce((sum, l) => sum + Number(l.amount ?? 0), 0));
+    if (!(total > 0)) {
+      throw new BadRequestException("A memo must have a positive total.");
+    }
+    // Only a credit note is bounded by the original — it can only give back what was charged. A
+    // debit note is an additional charge, not a refund, so no such ceiling applies to it (do not
+    // assume the credit-note ceiling is correct for DEB).
+    if (input.type === "CRE" && total > Number(original.totalAmount)) {
+      throw new BadRequestException(
+        `Credit memo total (${total}) exceeds invoice ${original.invoiceNumber}'s total (${original.totalAmount}).`,
+      );
+    }
+
+    const code = input.type === "CRE" ? "CRE" : "DEB";
+    const settled = input.type === "CRE";
+
+    return this.dataSource.transaction(async (mg) => {
+      const memo = await this.createInvoice(
+        {
+          source: original.source as Freight.InvoiceSource,
+          sourceId: original.id,
+          type: input.type === "CRE" ? "credit_note" : "debit_note",
+          companyId: original.companyId,
+          companyProfileId: original.companyProfileId,
+          shippingLineCompanyId: original.shippingLineCompanyId,
+          lines,
+          currency: original.currency,
+          subtotalAmount: total,
+          taxAmount: 0,
+          totalAmount: total,
+          ...(settled ? { status: Freight.InvoiceStatus.Paid, dueAt: new Date() } : {}),
+        },
+        mg,
+        code,
+      );
+
+      const patch: Record<string, unknown> = {
+        eimsDocumentType: input.type,
+        eimsReason: reason,
+        relatedInvoiceId: original.id,
+        ...(settled
+          ? { paidAmount: memo.totalAmount, balanceAmount: 0, paidAt: new Date() }
+          : {}),
+      };
+      await mg.update(Invoice, memo.id, patch);
+
+      this.logger.log(
+        `Issued ${input.type} memo ${memo.invoiceNumber} (${memo.id}) against invoice ${original.invoiceNumber}`,
+      );
+      return { ...memo, ...patch } as Invoice & { lines: InvoiceLine[] };
+    });
+  }
+
   private async createInvoice(
     input: GenerateInvoiceInput,
     mg: EntityManager,
+    code = "INV",
   ): Promise<Invoice & { lines: InvoiceLine[] }> {
     const currency = input.currency ?? "ETB";
     const status = input.status ?? Freight.InvoiceStatus.Pending;
@@ -870,7 +1002,7 @@ export class BillingService {
         (input.dueInDays ?? DEFAULT_DUE_DAYS) * 24 * 60 * 60 * 1000,
       );
 
-    const invoiceNumber = await this.nextInvoiceNumber(mg);
+    const invoiceNumber = await this.nextInvoiceNumber(mg, code);
 
     const invoice = await mg.save(
       mg.create(Invoice, {

apps/edr-freight-api/src/modules/billing/documents/invoice-document.service.spec.ts

@@ -44,3 +44,46 @@ describe("InvoiceDocumentService.buildHtml — EIMS QR", () => {
     );
   });
 });
+
+describe("InvoiceDocumentService.buildThermalHtml", () => {
+  const service = new InvoiceDocumentService({} as never, {} as never, {} as never);
+
+  it("renders no seal markup at all — dropped for thermal, not shrunk", () => {
+    const html = service.buildThermalHtml(model());
+    expect(html).not.toContain('class="seal"');
+    expect(html).not.toContain("seal-image");
+  });
+
+  it("renders the QR image when qrImageUrl is set, centered rather than absolutely positioned", () => {
+    const html = service.buildThermalHtml(model({ qrImageUrl: "data:image/png;base64,QR" }));
+    expect(html).toContain('class="qr"');
+    expect(html).toContain('src="data:image/png;base64,QR"');
+    expect(html).not.toContain("position: absolute");
+  });
+
+  it("wraps a long IRN summary value rather than truncating it", () => {
+    const irn = "9fe9bbbece6ab76c112b617534e6aac7aa8b819d5be79f4d3d088ed2e887b2e0";
+    const html = service.buildThermalHtml(model({ summary: [{ label: "EIMS IRN", value: irn }] }));
+    expect(html).toContain(irn);
+    expect(html).toContain("overflow-wrap: anywhere");
+  });
+
+  it("renders a line item as stacked description + qty x rate = amount, not a table row", () => {
+    const html = service.buildThermalHtml(
+      model({
+        lines: [{ description: "40ft container rail freight", quantity: 12, unitRate: 245683.95, amount: 2948207.4 }],
+      }),
+    );
+    expect(html).not.toContain("<table");
+    expect(html).not.toContain("<td");
+    expect(html).toContain("40ft container rail freight");
+    expect(html).toContain("12 x");
+    expect(html).toContain("2,948,207.4 Birr (ETB)");
+  });
+
+  it("uses fluid, full-width layout — no fixed-px A4 geometry", () => {
+    const html = service.buildThermalHtml(model());
+    expect(html).not.toContain("width: 330px");
+    expect(html).not.toContain("right: 160px");
+  });
+});

apps/edr-freight-api/src/modules/billing/documents/invoice-document.service.ts

@@ -18,6 +18,36 @@ import {
 
 export type InvoiceDocumentKind = "INVOICE" | "RECEIPT";
 
+/**
+ * MoR returns `signedQR`/`qr` as a base64 PNG already rendered server-side — confirmed against the
+ * Postman collection's `register` response (`signedQR` decodes to a PNG magic-byte header), not a
+ * payload we encode ourselves. Wrap, don't encode. Shared by `Invoice.eimsSignedQr`
+ * (`BillingService`) and `EimsReceipt.qr` (`eims-receipt-document.mapper.ts`) — same convention,
+ * same gateway.
+ */
+export const pngDataUrl = (base64: string): string => `data:image/png;base64,${base64}`;
+
+// ── Shared HTML-builder helpers (buildHtml + buildThermalHtml) ──────────────────────────────────
+// `buildFallbackPdf`'s own currency/money/date closures are a deliberately different, already-
+// established convention (bare "ETB" vs "Birr (ETB)") for the vector renderer — not touched here.
+
+function esc(value: unknown): string {
+  return String(value ?? "-")
+    .replace(/&/g, "&")
+    .replace(/</g, "&lt;")
+    .replace(/>/g, "&gt;")
+    .replace(/"/g, "&quot;")
+    .replace(/'/g, "&#39;");
+}
+
+function money(amount: unknown, currency: string): string {
+  return `${Number(amount ?? 0).toLocaleString()} ${currency === "ETB" ? "Birr (ETB)" : currency}`;
+}
+
+function formatDate(value: unknown): string {
+  return value ? new Date(value as string | Date).toLocaleDateString("en-GB") : "-";
+}
+
 /** One billed line on the document (charge type / fee type agnostic). */
 export interface InvoiceDocumentLine {
   description: string | null;
@@ -120,6 +150,117 @@ export class InvoiceDocumentService {
     };
   }
 
+  /**
+   * 80mm thermal invoice (ADD-P001) — physical page is the 80mm roll width; content stays within
+   * `THERMAL_MARGIN_MM` of each edge via `PdfRenderService`'s margin, not a narrower page, since
+   * thermal print mechanisms have a dead zone at the roll edge they can't reach either way.
+   *
+   * A genuinely different template from `buildHtml`, not a CSS variant of it: the A4 layout is
+   * absolutely-positioned and fixed-px (`.seal{right:28px}`, `.qr{right:160px}`,
+   * `.totals{width:330px}`), tuned for a 210mm page — none of it reflows at 72mm printable width.
+   * No seal here at all (a decorative wet-ink-style stamp is an A4/laser convention; no real POS
+   * thermal receipt carries one, and thermal heads render rotated circles badly) and line items
+   * are stacked (description, then `qty x rate = amount` below it) rather than a table — a real
+   * multi-column table leaves ~10-14 chars for description at this width, truncating almost every
+   * line, which stacking avoids entirely. No Chromium-less fallback — see `renderThermal`.
+   */
+  async renderThermal(model: InvoiceDocumentModel): Promise<{ filename: string; buffer: Buffer }> {
+    const logoImageUrl =
+      model.logoImageUrl !== undefined ? model.logoImageUrl : await this.logoSettings.getLogoImageUrl();
+    // Seal deliberately dropped — never fetched, so no stampSettings call either.
+    const resolvedModel: InvoiceDocumentModel = { ...model, logoImageUrl, stampImageUrl: null };
+
+    const html = this.buildThermalHtml(resolvedModel);
+    return {
+      filename: `${this.safeFilename(model.documentNumber)}-thermal.pdf`,
+      buffer: await this.pdf.htmlToPdfBuffer(html, {
+        label: `${model.title} thermal invoice`,
+        thermal: true,
+        // A generic A4-shaped, QR-less fallback is not an acceptable stand-in for "the thermal
+        // printer output" — fail loudly instead; the caller has the A4 download to fall back to.
+        noFallback: true,
+      }),
+    };
+  }
+
+  buildThermalHtml(model: InvoiceDocumentModel): string {
+    const heading = `${model.title} ${model.kind === "RECEIPT" ? "Receipt" : "Invoice"}`;
+    const logoInner = logoMarkup(model.logoImageUrl, "thermal-logo");
+
+    const summaryRows = model.summary
+      .map(
+        (row) =>
+          `<div class="row"><span class="label">${esc(row.label)}</span><span class="value">${esc(row.value)}</span></div>`,
+      )
+      .join("");
+
+    const itemBlocks = model.lines
+      .map((item) => {
+        const currency = item.currency ?? model.currency;
+        return `<div class="item">
+        <div class="item-desc">${esc(item.description)}</div>
+        <div class="item-calc">${esc(item.quantity ?? 0)} x ${esc(money(item.unitRate, currency))} = <strong>${esc(money(item.amount, currency))}</strong></div>
+      </div>`;
+      })
+      .join("");
+
+    const totalRows = model.totals
+      .map(
+        (total) =>
+          `<div class="total-row${total.grand ? " grand" : ""}"><span>${esc(total.label)}</span><strong>${esc(money(total.amount, model.currency))}</strong></div>`,
+      )
+      .join("");
+
+    const qrMarkup = model.qrImageUrl
+      ? `<div class="qr"><img src="${esc(model.qrImageUrl)}" alt="EIMS verification QR" /><div class="qr-caption">Scan to verify (MoR EIMS)</div></div>`
+      : "";
+
+    return `<!doctype html>
+<html>
+<head>
+  <meta charset="utf-8" />
+  <title>${esc(heading)}</title>
+  <style>
+    body { font-family: Arial, sans-serif; font-size: 9px; color: #0f172a; margin: 0; }
+    .doc { width: 100%; box-sizing: border-box; }
+    .thermal-logo { display: block; max-height: 28px; max-width: 100%; object-fit: contain; margin: 0 auto 4px; }
+    .brand { text-align: center; font-size: 9px; text-transform: uppercase; letter-spacing: .05em; }
+    .title { text-align: center; font-size: 13px; font-weight: 800; margin: 2px 0; }
+    .meta { text-align: center; font-size: 8px; color: #475569; margin-bottom: 4px; }
+    .rule { border-top: 1px dashed #334155; margin: 6px 0; }
+    .row { display: flex; justify-content: space-between; gap: 6px; font-family: monospace; font-size: 8.5px; padding: 1px 0; }
+    .row .label { color: #64748b; white-space: nowrap; }
+    .row .value { text-align: right; overflow-wrap: anywhere; }
+    .item { margin: 4px 0; }
+    .item-desc { font-size: 9px; overflow-wrap: anywhere; }
+    .item-calc { text-align: right; font-family: monospace; font-size: 8.5px; }
+    .total-row { display: flex; justify-content: space-between; font-size: 9px; padding: 2px 0; }
+    .total-row.grand { font-size: 11px; font-weight: 800; border-top: 1px solid #0f172a; margin-top: 3px; padding-top: 4px; }
+    .qr { text-align: center; margin: 8px 0; }
+    .qr img { width: 150px; height: 150px; }
+    .qr-caption { font-size: 7px; color: #64748b; margin-top: 2px; }
+    .footer { text-align: center; font-size: 7px; color: #94a3b8; margin-top: 8px; }
+  </style>
+</head>
+<body>
+  <div class="doc">
+    ${logoInner}
+    <div class="brand">Ethio-Djibouti Railway S.C.</div>
+    <div class="title">${esc(heading)}</div>
+    <div class="meta">${esc(model.documentNumber)} &middot; ${esc(formatDate(model.issuedAt))}</div>
+    <div class="rule"></div>
+    ${summaryRows}
+    <div class="rule"></div>
+    ${itemBlocks}
+    <div class="rule"></div>
+    ${totalRows}
+    ${qrMarkup}
+    <div class="footer">Thank you</div>
+  </div>
+</body>
+</html>`;
+  }
+
   /**
    * Vector-drawn styled invoice/receipt used when headless Chromium is
    * unavailable. Mirrors the HTML layout closely enough to pass as the same
@@ -241,18 +382,7 @@ export class InvoiceDocumentService {
   }
 
   buildHtml(model: InvoiceDocumentModel): string {
-    const esc = (value: unknown) =>
-      String(value ?? "-")
-        .replace(/&/g, "&amp;")
-        .replace(/</g, "&lt;")
-        .replace(/>/g, "&gt;")
-        .replace(/"/g, "&quot;")
-        .replace(/'/g, "&#39;");
-    const money = (amount: unknown, currency = model.currency) =>
-      `${Number(amount ?? 0).toLocaleString()} ${currency === "ETB" ? "Birr (ETB)" : currency}`;
-    const date = (value: unknown) =>
-      value ? new Date(value as string | Date).toLocaleDateString("en-GB") : "-";
-
+    const date = formatDate;
     const showCategory = Boolean(model.categoryHeader);
     const sealText =
       model.sealText ?? (model.kind === "RECEIPT" || model.status === "PAID" ? "EDR PAID" : "EDR");
@@ -283,7 +413,7 @@ export class InvoiceDocumentService {
     const totalRows = model.totals
       .map(
         (total) =>
-          `<div class="total-row${total.grand ? " grand" : ""}"><span>${esc(total.label)}</span><strong>${esc(money(total.amount))}</strong></div>`,
+          `<div class="total-row${total.grand ? " grand" : ""}"><span>${esc(total.label)}</span><strong>${esc(money(total.amount, model.currency))}</strong></div>`,
       )
       .join("");
 

apps/edr-freight-api/src/modules/billing/documents/pdf-render.service.ts

@@ -15,15 +15,43 @@ const PDF_PRINT_STYLES = `
   }
 </style>`;
 
+/**
+ * Physical roll width. Content stays within `THERMAL_MARGIN_MM` of each edge — every mainstream
+ * ESC/POS thermal head (Epson TM-T88, Star, Bixolon) has a dead zone near the edge of an 80mm roll
+ * it physically can't reach, so the page itself must stay 80mm (matching the roll the printer
+ * driver expects) with the safe area carved out by margin, not by shrinking the page.
+ */
+const THERMAL_PAGE_WIDTH_MM = 80;
+const THERMAL_MARGIN_MM = 4;
+/** Extra length past the measured content, so the cut isn't flush against the last line. */
+const THERMAL_FEED_MM = 6;
+/** Guard against a runaway line-item list producing an absurd page. */
+const THERMAL_MAX_HEIGHT_MM = 1500;
+
 export interface PdfRenderOptions {
   /** Label used in logs to identify the document kind. */
   label?: string;
   /** Landscape A4 instead of the default portrait — wide tables need it. */
   landscape?: boolean;
+  /**
+   * Render as an 80mm continuous thermal receipt instead of a fixed A4 page: content width is
+   * measured and the page height grows to fit it, rather than a fixed page with the format's
+   * `format: "A4"`.
+   */
+  thermal?: boolean;
+  /**
+   * Refuse to degrade to a fallback PDF on failure — throw instead. For a thermal request, a
+   * generic A4-shaped, QR-less fallback is not an acceptable stand-in for "the thermal printer
+   * output" (it silently hands back a different document shape than what was asked for); the
+   * caller has an existing A4 download to point the user at instead. Ignored when `fallback` is
+   * also supplied — an explicit fallback always wins.
+   */
+  noFallback?: boolean;
   /**
    * Degraded renderer used when Chromium is unavailable. Receives the
    * print-prepared HTML and must return a valid PDF buffer (≥ 2KB, `%PDF-`
-   * header). When omitted, a generic single-page fallback is produced.
+   * header). When omitted (and `noFallback` is not set), a generic single-page fallback is
+   * produced.
    */
   fallback?: (preparedHtml: string) => Buffer;
 }
@@ -54,17 +82,31 @@ export class PdfRenderService {
       const browser = await puppeteer.default.launch(launchOptions);
       try {
         const page = await browser.newPage();
-        await page.setViewport({ width: 794, height: 1123, deviceScaleFactor: 1 });
+        const thermal = opts.thermal ?? false;
+        const viewportWidth = thermal ? Math.round((THERMAL_PAGE_WIDTH_MM / 25.4) * 96) : 794;
+        await page.setViewport({ width: viewportWidth, height: 1123, deviceScaleFactor: 1 });
         await page.setContent(preparedHtml, { waitUntil: "load", timeout: 60_000 });
         await page.emulateMediaType("print");
         await new Promise((resolve) => setTimeout(resolve, 250));
 
-        const pdf = await page.pdf({
-          format: "A4",
-          landscape: opts.landscape ?? false,
-          printBackground: true,
-          margin: { top: "16mm", bottom: "18mm", left: "14mm", right: "14mm" },
-        });
+        const pdf = thermal
+          ? await page.pdf({
+              width: `${THERMAL_PAGE_WIDTH_MM}mm`,
+              height: `${await this.thermalContentHeightMm(page)}mm`,
+              printBackground: true,
+              margin: {
+                top: `${THERMAL_MARGIN_MM}mm`,
+                bottom: `${THERMAL_MARGIN_MM + THERMAL_FEED_MM}mm`,
+                left: `${THERMAL_MARGIN_MM}mm`,
+                right: `${THERMAL_MARGIN_MM}mm`,
+              },
+            })
+          : await page.pdf({
+              format: "A4",
+              landscape: opts.landscape ?? false,
+              printBackground: true,
+              margin: { top: "16mm", bottom: "18mm", left: "14mm", right: "14mm" },
+            });
 
         const buffer = Buffer.from(pdf);
         if (!this.isValidPdf(buffer)) {
@@ -79,6 +121,15 @@ export class PdfRenderService {
       }
     } catch (error) {
       this.logger.error(`${label} PDF failed (executable=${executablePath ?? "default"}): ${error}`);
+      if (!opts.fallback && opts.noFallback) {
+        // A generic A4-shaped, QR-less fallback is not an acceptable stand-in for "the thermal
+        // printer output" — it silently hands back a different document than what was asked for.
+        // Fail loudly instead; the caller already has a working A4 download to fall back to.
+        throw new InternalServerErrorException(
+          `${label} could not be generated — thermal rendering requires Chromium. ` +
+            "Ensure Chromium is installed or set PUPPETEER_EXECUTABLE_PATH, or download the A4 PDF instead.",
+        );
+      }
       const fallback = (opts.fallback ?? ((h) => this.genericFallbackPdf(h)))(preparedHtml);
       if (this.isValidPdf(fallback)) {
         this.logger.warn(
@@ -92,6 +143,20 @@ export class PdfRenderService {
     }
   }
 
+  /**
+   * Thermal receipts are continuous-roll — there is no fixed page height. Measures the rendered
+   * content's actual height and adds feed clearance, so the PDF page is exactly as long as the
+   * receipt, not a fixed A4-length page with blank space at the bottom.
+   */
+  private async thermalContentHeightMm(page: import("puppeteer").Page): Promise<number> {
+    // String form, not a typed closure: this project's tsconfig has no `dom` lib, so `document`
+    // isn't a known global to type-check against — the string is evaluated in the page's own
+    // browser context regardless, same as the closure form would be.
+    const scrollPx = (await page.evaluate("document.documentElement.scrollHeight")) as number;
+    const contentMm = (scrollPx / 96) * 25.4 + THERMAL_MARGIN_MM * 2 + THERMAL_FEED_MM;
+    return Math.min(THERMAL_MAX_HEIGHT_MM, contentMm);
+  }
+
   private injectPdfPrintStyles(html: string): string {
     if (html.includes("edr-pdf-print-fix")) return html;
     if (html.includes("</head>")) {

apps/edr-freight-api/src/modules/billing/dto/issue-memo.dto.ts

@@ -0,0 +1,71 @@
+import { ApiProperty, ApiPropertyOptional } from "@nestjs/swagger";
+import { Type } from "class-transformer";
+import {
+  IsArray,
+  IsIn,
+  IsNumber,
+  IsObject,
+  IsOptional,
+  IsString,
+  Length,
+  ValidateNested,
+} from "class-validator";
+
+/** One line on a memo; omit the whole `lines` array on the parent DTO to copy the original's. */
+export class MemoLineDto {
+  @ApiProperty()
+  @IsString()
+  chargeType!: string;
+
+  @ApiPropertyOptional()
+  @IsOptional()
+  @IsString()
+  description?: string;
+
+  @ApiPropertyOptional()
+  @IsOptional()
+  @IsNumber()
+  quantity?: number;
+
+  @ApiPropertyOptional()
+  @IsOptional()
+  @IsNumber()
+  unitRate?: number;
+
+  @ApiPropertyOptional()
+  @IsOptional()
+  @IsNumber()
+  amount?: number;
+
+  @ApiPropertyOptional()
+  @IsOptional()
+  @IsString()
+  currency?: string;
+
+  @ApiPropertyOptional()
+  @IsOptional()
+  @IsObject()
+  metadata?: Record<string, unknown>;
+}
+
+/** `POST billing/invoices/:id/memo` body — see `BillingService.issueMemo`. */
+export class IssueMemoDto {
+  @ApiProperty({ enum: ["CRE", "DEB"], description: "MoR DocumentDetails.Type for the memo." })
+  @IsIn(["CRE", "DEB"])
+  type!: "CRE" | "DEB";
+
+  @ApiProperty({ description: "Why the memo was issued — MoR DocumentDetails.Reason." })
+  @IsString()
+  @Length(1, 500)
+  reason!: string;
+
+  @ApiPropertyOptional({
+    type: [MemoLineDto],
+    description: "Omit to copy every line of the original invoice verbatim.",
+  })
+  @IsOptional()
+  @IsArray()
+  @ValidateNested({ each: true })
+  @Type(() => MemoLineDto)
+  lines?: MemoLineDto[];
+}

apps/edr-freight-api/src/modules/billing/eims-invoice.mapper.spec.ts

@@ -212,6 +212,59 @@ describe("toEimsInvoice", () => {
     expect(() => toEimsInvoice(invoice({ issuedAt: null }), seller, context())).toThrow(/not issued/);
   });
 
+  describe("debit/credit notes — confirmed by MoR support, same /v1/register endpoint", () => {
+    it("defaults DocumentDetails.Type to INV with no Reason field", () => {
+      const doc = toEimsInvoice(invoice(), seller, context());
+      expect(doc.DocumentDetails.Type).toBe("INV");
+      expect(doc.DocumentDetails).not.toHaveProperty("Reason");
+    });
+
+    it("files a credit note with Type, Reason and RelatedDocument", () => {
+      const doc = toEimsInvoice(
+        invoice(),
+        seller,
+        context({
+          documentType: "CRE",
+          reason: "Overbilled freight charge",
+          relatedDocument: "9fe9bbbece6ab76c112b617534e6aac7aa8b819d5be79f4d3d088ed2e887b2e0",
+        }),
+      );
+      expect(doc.DocumentDetails).toMatchObject({ Type: "CRE", Reason: "Overbilled freight charge" });
+      expect(doc.ReferenceDetails.RelatedDocument).toBe(
+        "9fe9bbbece6ab76c112b617534e6aac7aa8b819d5be79f4d3d088ed2e887b2e0",
+      );
+    });
+
+    it("files a debit note the same way", () => {
+      const doc = toEimsInvoice(
+        invoice(),
+        seller,
+        context({ documentType: "DEB", reason: "Additional handling fee", relatedDocument: "IRN-1" }),
+      );
+      expect(doc.DocumentDetails).toMatchObject({ Type: "DEB", Reason: "Additional handling fee" });
+    });
+
+    it("throws when a credit/debit note has no reason", () => {
+      expect(() =>
+        toEimsInvoice(
+          invoice(),
+          seller,
+          context({ documentType: "CRE", reason: null, relatedDocument: "IRN-1" }),
+        ),
+      ).toThrow(/needs a reason/);
+    });
+
+    it("throws when a credit/debit note has no relatedDocument", () => {
+      expect(() =>
+        toEimsInvoice(
+          invoice(),
+          seller,
+          context({ documentType: "CRE", reason: "Overbilled", relatedDocument: null }),
+        ),
+      ).toThrow(/needs.*relatedDocument/);
+    });
+  });
+
   it("throws when the lines do not sum to the invoice total", () => {
     expect(() => toEimsInvoice(invoice({ totalAmount: "9000.00" }), seller, context())).toThrow(
       /lines sum to 11000 but the invoice total is 9000/,

apps/edr-freight-api/src/modules/billing/eims-invoice.mapper.ts

@@ -20,8 +20,15 @@ import { round2 } from "./invoice-settlement.util";
 /** Only proven-required constant: the 400 SCHEMA ERROR sample rejects a payload without it. */
 const EIMS_VERSION = "1";
 
-/** The only `DocumentDetails.Type` observed in the supplied material. */
-const EIMS_DOCUMENT_TYPE = "INV";
+/**
+ * `DocumentDetails.Type`. `"INV"` is the only value observed in the collection; `"DEB"`/`"CRE"`
+ * (debit/credit note) were confirmed directly by MoR support — same `/v1/register` endpoint, no
+ * separate API. MoR's answer, verbatim: "the same endpoint used for registration should be used
+ * ... within the Document Detail object, you should specify DEB for a debit note, CRE for a
+ * credit note... add a Reason attribute under document detail object".
+ */
+export const EIMS_DOCUMENT_TYPES = ["INV", "DEB", "CRE"] as const;
+export type EimsDocumentType = (typeof EIMS_DOCUMENT_TYPES)[number];
 
 export interface EimsBuyerDetails {
   City: string | null;
@@ -60,7 +67,9 @@ export interface EimsDocumentDetails {
   DocumentNumber: string;
   /** Observed format `dd-MM-yyyyTHH:mm:ss`. Rule seen in the collection: within 3 days of now. */
   Date: string;
-  Type: string;
+  Type: EimsDocumentType;
+  /** Only for DEB/CRE, per MoR support — why the debit/credit note was issued. Absent for INV. */
+  Reason?: string;
 }
 
 export interface EimsInvoiceItem {
@@ -212,7 +221,18 @@ export interface EimsMapperContext {
   unitDefault: string;
   incomeWithholdValue: number;
   transactionWithholdValue: number;
-  /** Null for an ordinary invoice; set only for a real related-document case. */
+  /**
+   * `DocumentDetails.Type`. Defaults to `"INV"`. For `"DEB"`/`"CRE"` both `reason` and
+   * `relatedDocument` become required — confirmed directly by MoR support, not the collection.
+   */
+  documentType?: EimsDocumentType;
+  /** Required when `documentType` is `"DEB"`/`"CRE"` — why the note was issued. Unused for INV. */
+  reason?: string | null;
+  /**
+   * `ReferenceDetails.RelatedDocument`. Null for an ordinary invoice; required for a DEB/CRE —
+   * the original registered invoice's IRN, per MoR's own IRC-P06/P07 checklist ("credit memo
+   * from a registered invoice").
+   */
   relatedDocument?: string | null;
   /** MoR numeric country code for the buyer; our DB stores the country name. */
   buyerCountryCode?: string | null;
@@ -326,6 +346,26 @@ export function toEimsInvoice(
     );
   }
 
+  const documentType = context.documentType ?? "INV";
+  if (!EIMS_DOCUMENT_TYPES.includes(documentType)) {
+    throw new Error(
+      `EIMS mapping: invoice ${invoice.invoiceNumber} has documentType "${documentType}", must be one of ${EIMS_DOCUMENT_TYPES.join(", ")}`,
+    );
+  }
+  if (documentType !== "INV") {
+    if (!context.reason?.trim()) {
+      throw new Error(
+        `EIMS mapping: invoice ${invoice.invoiceNumber} is a ${documentType} (debit/credit note) and needs a reason`,
+      );
+    }
+    if (!context.relatedDocument?.trim()) {
+      throw new Error(
+        `EIMS mapping: invoice ${invoice.invoiceNumber} is a ${documentType} (debit/credit note) and needs ` +
+          "relatedDocument — the original registered invoice's IRN",
+      );
+    }
+  }
+
   const issuedAt = invoice.issuedAt instanceof Date ? invoice.issuedAt : new Date(invoice.issuedAt);
   if (Number.isNaN(issuedAt.getTime())) {
     throw new Error(`EIMS mapping: invoice ${invoice.invoiceNumber} has an unparseable issuedAt`);
@@ -430,7 +470,8 @@ export function toEimsInvoice(
     DocumentDetails: {
       DocumentNumber: context.documentNumber,
       Date: (context.formatDate ?? formatEimsDate)(issuedAt),
-      Type: EIMS_DOCUMENT_TYPE,
+      Type: documentType,
+      ...(documentType !== "INV" ? { Reason: context.reason! } : {}),
     },
     ItemList,
     PaymentDetails: { Mode: context.payment.mode, PaymentTerm: context.payment.term },

apps/edr-freight-api/src/modules/billing/entities/invoice.entity.ts

@@ -180,4 +180,27 @@ export class Invoice extends BaseEntity {
 
   @Column({ name: "eims_cancellation_remark", type: "text", nullable: true })
   eimsCancellationRemark?: string | null;
+
+  /**
+   * `DocumentDetails.Type` to file this invoice as — "INV" (default), "DEB" or "CRE". Confirmed
+   * by MoR support directly (not the collection): debit/credit notes go through this same
+   * `/v1/register` endpoint, distinguished only by `Type` + `Reason`, linked via
+   * `ReferenceDetails.RelatedDocument` to the original invoice's IRN. This module does not create
+   * debit/credit note invoices — that is a freight-workflow decision — it only files one
+   * correctly once these columns are set on an existing row.
+   */
+  @Column({ name: "eims_document_type", type: "varchar", length: 8, default: "INV" })
+  eimsDocumentType!: string;
+
+  /** Required by MoR when `eimsDocumentType` is DEB/CRE — why the note was issued. */
+  @Column({ name: "eims_reason", type: "text", nullable: true })
+  eimsReason?: string | null;
+
+  /** The original registered invoice this debit/credit note adjusts. Required for DEB/CRE. */
+  @Column({ name: "related_invoice_id", type: "uuid", nullable: true })
+  relatedInvoiceId?: string | null;
+
+  @ManyToOne(() => Invoice)
+  @JoinColumn({ name: "related_invoice_id" })
+  relatedInvoice?: Invoice | null;
 }