diff --git a/src/main/kotlin/com/android/trisolarisserver/controller/RazorpayPaymentLinksController.kt b/src/main/kotlin/com/android/trisolarisserver/controller/RazorpayPaymentLinksController.kt
index 4892da8..083d769 100644
--- a/src/main/kotlin/com/android/trisolarisserver/controller/RazorpayPaymentLinksController.kt
+++ b/src/main/kotlin/com/android/trisolarisserver/controller/RazorpayPaymentLinksController.kt
@@ -94,7 +94,7 @@ class RazorpayPaymentLinksController(
             "description" to (request.description ?: "Booking $bookingId"),
             "notes" to notes,
             // Razorpay requires reference_id to be unique per active link
-            "reference_id" to "${bookingId}-${OffsetDateTime.now().toEpochSecond()}"
+            "reference_id" to "bk_${bookingId.toString().replace("-", "").take(12)}_${OffsetDateTime.now().toEpochSecond()}"
         )
         parseExpiryEpoch(request.expiryDate)?.let { payload["expire_by"] = it }
         request.isPartialPaymentAllowed?.let { payload["partial_payment"] = it }