changes export flow

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

@@ -1002,6 +1002,23 @@ export class BillingService {
       );
     }
 
+    // A booking's PREPAID invoice is only payable inside its pay window —
+    // `dueAt` mirrors booking.paymentDeadline (issuePayable at reserve time).
+    // Blocking INITIATION here is what makes the deadline real: the settle
+    // sweep's grace only shelters payments that started before this gate.
+    // Other invoice types keep dueAt as display-only.
+    if (
+      invoice.source === Freight.InvoiceSource.Booking &&
+      invoice.type === "PREPAID" &&
+      invoice.dueAt &&
+      invoice.dueAt.getTime() <= Date.now()
+    ) {
+      throw new BadRequestException(
+        "The payment window for this booking has closed — the reserved wagons " +
+          "were released. Please book again.",
+      );
+    }
+
     const amountDue = Number(invoice.balanceAmount ?? invoice.totalAmount);
     if (!(amountDue > 0)) {
       throw new BadRequestException("Invoice has no outstanding balance.");