fix: duplicate invoice

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

@@ -696,16 +696,17 @@ export class BillingService {
   // ── Payment reconciliation (by source) ───────────────────────────────────────
 
   /**
-   * The invoice a gateway payment should settle for a source record, or null if
-   * none. This is the billing document of record for "what is owed" — callers
-   * (e.g. {@link payInvoice}) charge `invoice.totalAmount` against it rather than
-   * recomputing from the source's own total, so discounts/penalties/adjustments
-   * carried on the invoice are honored.
+   * The invoice a source record already has open, or null if it needs a new
+   * one. This is the idempotency check every `ensureInvoiceFor*` (booking,
+   * first-mile, last-mile) runs before generating — it must see DRAFT
+   * invoices too, not just issued ones, otherwise a source that already has
+   * an unissued draft gets a second, duplicate invoice minted alongside it
+   * instead of that draft being reused and then issued.
    *
    * Pass `type` to select a specific invoice when a source carries several (e.g.
    * a booking's up-front vs final charge); omit it to settle whichever single
-   * invoice is currently open. Returns the most recent matching open (unpaid,
-   * non-cancelled) invoice.
+   * invoice is currently open. Returns the most recent matching draft-or-open
+   * (unpaid, non-cancelled) invoice.
    */
   findPayable(
     source: Freight.InvoiceSource,
@@ -716,7 +717,7 @@ export class BillingService {
       where: {
         source,
         sourceId,
-        status: In(OPEN_STATUSES),
+        status: In([Freight.InvoiceStatus.Draft, ...OPEN_STATUSES]),
         ...(type ? { type } : {}),
       },
       order: { issuedAt: "DESC" },
@@ -875,9 +876,7 @@ export class BillingService {
       // service branches on a domain-specific reference type.
       referenceType: PaymentReferenceType.SHIPMENT,
       orderRef: invoice.invoiceNumber,
-      // True minor units (cents) — every provider adapter divides by 100 to
-      // get the major amount it charges.
-      amountMinor: Math.round(Number(invoice.balanceAmount) * 100),
+      amountMinor: Math.round(Number(invoice.balanceAmount)),
       currency: invoice.currency,
       reason: `Payment for invoice ${invoice.invoiceNumber}`,
       method: opts.method ?? "TELEBIRR",