diff --git a/src/modules/user/services/payment.service.ts b/src/modules/user/services/payment.service.ts
index 6f8c662..c0a9603 100644
--- a/src/modules/user/services/payment.service.ts
+++ b/src/modules/user/services/payment.service.ts
@@ -12,6 +12,17 @@ const razorpay = new Razorpay({
   key_secret: config.RAZORPAY_KEY_SECRET,
 });
 
+const buildUniqueReceipt = (input?: string) => {
+  const normalizedPrefix = (input?.trim() || 'receipt')
+    .replace(/[^a-zA-Z0-9_-]/g, '_')
+    .replace(/_+/g, '_')
+    .slice(0, 20);
+  const timePart = Date.now().toString(36);
+  const randomPart = crypto.randomBytes(4).toString('hex');
+
+  return `${normalizedPrefix}_${timePart}_${randomPart}`.slice(0, 100);
+};
+
 type RazorpayWebhookPayload = {
   event?: string;
   payload?: {
@@ -91,7 +102,7 @@ export class PaymentService {
     }
 
     const amountInPaise = Math.round(payload.amount * 100);
-    const receipt = payload.receipt ?? `receipt_${Date.now()}`;
+    const receipt = buildUniqueReceipt(payload.receipt);
     const currency = payload.currency ?? 'INR';
 
     const order = (await razorpay.orders.create({