changes export flow

apps/edr-freight-api/src/modules/train-scheduling/booking-batch.constants.ts

@@ -9,6 +9,17 @@
 
 export const BATCH_TIMEZONE = 'Africa/Addis_Ababa';
 
+/**
+ * Slack after a booking's paymentDeadline before the settle sweep expires it.
+ * Covers gateway/webhook lag for a payment STARTED inside the window —
+ * initiation itself is hard-blocked at the deadline (BillingService.payInvoice),
+ * so this never extends the time a customer has to begin paying.
+ */
+export const PAYMENT_GRACE_MS = 5 * 60_000;
+
+/** How long before the pay deadline the one reminder notification goes out. */
+export const PAYMENT_REMINDER_LEAD_MS = 10 * 60_000;
+
 /** Fallback wagons-per-booking when a booking has no computed `wagonsRequired`. */
 export const DEFAULT_WAGONS_PER_BOOKING = 1;