train gate pass, Telebirr and Wafi

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

@@ -657,6 +657,11 @@ export class BillingService {
       throw new NotFoundException(`No open invoice to charge for ${source}:${sourceId}`);
     }
 
+    const amountDue = Number(invoice.balanceAmount ?? invoice.totalAmount);
+    if (!(amountDue > 0)) {
+      throw new BadRequestException("Invoice has no outstanding balance.");
+    }
+
     const result = await this.payment.initiate({
       referenceId: sourceId,
       source: invoice.source,
@@ -667,7 +672,7 @@ export class BillingService {
       // service branches on a domain-specific reference type.
       referenceType: PaymentReferenceType.SHIPMENT,
       orderRef: invoice.invoiceNumber,
-      amountMinor: Math.round(Number(invoice.totalAmount)),
+      amountMinor: Math.round(amountDue),
       currency: invoice.currency,
       reason: `Payment for invoice ${invoice.invoiceNumber}`,
       method: opts.method ?? "TELEBIRR",