fix(billing): ceil CBE invoice amounts to whole birr

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

@@ -668,3 +668,66 @@ describe("BillingService — CAC Bank (OTP debit)", () => {
     expect(confirmOtp).toHaveBeenCalledWith("intent-1", "123456");
   });
 });
+
+describe("BillingService — CBE bill amounts round UP to whole birr", () => {
+  // CBE bills whole birr. Ceil, never Math.round: a .40 balance rounded down
+  // settles 0.40 short while markInvoiceAsPaid still writes paidAmount =
+  // totalAmount — money missing from the bank with the books saying paid.
+  // payInvoice and billQuery must agree, or /cbe/payment sees a mismatch.
+  const invoice = {
+    id: "inv-1",
+    status: Freight.InvoiceStatus.Pending,
+    source: Freight.InvoiceSource.Booking,
+    sourceId: "booking-1",
+    type: "PREPAID",
+    invoiceNumber: "INV-20260101-00001",
+    currency: "ETB",
+    // .40 — the case Math.round gets wrong (rounds down, underpays).
+    balanceAmount: 12345.4,
+    totalAmount: 12345.4,
+    company: { name: "Acme PLC" },
+    paymentId: null,
+    dueAt: null,
+  };
+
+  const build = (payment: Record<string, unknown> = {}) => {
+    const repo = {
+      findOne: jest.fn().mockResolvedValue(invoice),
+      update: jest.fn().mockResolvedValue(undefined),
+    };
+    const service = new BillingService(
+      { getRepository: () => repo } as never,
+      {} as never,
+      {} as never,
+      makeEvents() as never,
+      payment as never,
+      {} as never,
+      {} as never,
+    );
+    return { service, repo };
+  };
+
+  it("opens the intent for the ceiled balance, never below it", async () => {
+    const initiate = jest.fn().mockResolvedValue({
+      intentId: "intent-1",
+      immediateSuccess: false,
+      response: { intentId: "intent-1", status: "REQUIRES_ACTION" },
+    });
+    const { service } = build({ initiate });
+
+    await service.payInvoice("inv-1", { method: "CBE_BILL" });
+
+    expect(initiate).toHaveBeenCalledWith(
+      expect.objectContaining({ amountMinor: 12346 }),
+    );
+  });
+
+  it("quotes the same ceiled amount on bill-query as payInvoice opened", async () => {
+    const { service } = build();
+
+    await expect(service.billQuery("booking-1")).resolves.toMatchObject({
+      stillPayable: true,
+      currentAmountMinor: 12346,
+    });
+  });
+});