Validate Razorpay refund amount against payment

src/main/kotlin/com/android/trisolarisserver/controller/RazorpayRefundsController.kt

@@ -67,6 +67,11 @@ class RazorpayRefundsController(
             if (payment.booking.id != bookingId || payment.property.id != propertyId) {
                 throw ResponseStatusException(HttpStatus.NOT_FOUND, "Payment not found for booking")
             }
+            request.amount?.let {
+                if (it > payment.amount) {
+                    throw ResponseStatusException(HttpStatus.BAD_REQUEST, "amount must be <= payment amount")
+                }
+            }
             payment.gatewayPaymentId
                 ?: throw ResponseStatusException(HttpStatus.BAD_REQUEST, "Payment is missing gateway id")
         }