diff --git a/handlers/payments/kassai.py b/handlers/payments/kassai.py
index 8231ad0a..c09f5259 100644
--- a/handlers/payments/kassai.py
+++ b/handlers/payments/kassai.py
@@ -12,7 +12,7 @@ from sqlalchemy.ext.asyncio import AsyncSession
 
 from config import (
     KASSAI_ENABLE, KASSAI_API_KEY, KASSAI_SECRET_KEY, KASSAI_DOMAIN, KASSAI_SHOP_ID,
-    REDIRECT_LINK, FAIL_REDIRECT_LINK, WEBHOOK_HOST, KASSAI_IP
+    REDIRECT_LINK, FAIL_REDIRECT_LINK, WEBHOOK_HOST, KASSAI_IP, KASSAI_SUCCESS_URL, KASSAI_FAILURE_URL
 )
 
 from handlers.buttons import BACK, PAY_2, KASSAI_CARDS, KASSAI_SBP
@@ -287,7 +287,7 @@ async def generate_kassai_payment_link(amount: int, tg_id: int, method: dict) ->
     """
     nonce = int(time.time())
     unique_payment_id = f"{nonce}_{tg_id}"
-    url = f"https://api.fk.life/v1/orders/create?paymentId={unique_payment_id}"
+    url = "https://api.fk.life/v1/orders/create"
     
     headers = {
         "Content-Type": "application/json",
@@ -303,7 +303,10 @@ async def generate_kassai_payment_link(amount: int, tg_id: int, method: dict) ->
         "email": client_email,
         "ip": client_ip,
         "amount": int(amount),
-        "currency": "RUB"
+        "currency": "RUB",
+        "success_url": KASSAI_SUCCESS_URL,
+        "failure_url": KASSAI_FAILURE_URL,
+        "paymentId": unique_payment_id
     }
     
     sorted_keys = sorted(data_for_signature.keys())
diff --git a/web/kassai_payment.py b/web/kassai_payment.py
index d21169f2..c8a4c425 100644
--- a/web/kassai_payment.py
+++ b/web/kassai_payment.py
@@ -37,6 +37,8 @@ async def kassai_payment_webhook(request: web.Request):
         p_email = data_dict.get("P_EMAIL")
         intid = data_dict.get("intid")
         
+        logger.info(f"KassaAI payment: intid={intid}, MERCHANT_ORDER_ID={merchant_order_id}, amount={amount}")
+        
         if not amount or not intid:
             logger.error(f"KassaAI: Missing AMOUNT or intid")
             return web.Response(status=400, text="Missing required fields")
@@ -45,6 +47,10 @@ async def kassai_payment_webhook(request: web.Request):
             logger.warning(f"KassaAI: Duplicate payment intid={intid}")
             return web.Response(status=200, text="YES")
         
+        if merchant_order_id and merchant_order_id in processed_payments:
+            logger.warning(f"KassaAI: Duplicate payment MERCHANT_ORDER_ID={merchant_order_id}")
+            return web.Response(status=200, text="YES")
+        
         try:
             if p_email and "@" in p_email:
                 tg_id = int(p_email.split("@")[0])
@@ -80,8 +86,10 @@ async def kassai_payment_webhook(request: web.Request):
             logger.warning(f"Error handling payment message deletion: {e}")
         
         processed_payments.add(intid)
+        if merchant_order_id:
+            processed_payments.add(merchant_order_id)
         
-        logger.info(f"✅ KassaAI: Payment processed for user {tg_id}, amount {amount_float}, intid={intid}")
+        logger.info(f"✅ KassaAI: Payment processed for user {tg_id}, amount {amount_float}, intid={intid}, MERCHANT_ORDER_ID={merchant_order_id}")
         return web.Response(status=200, text="YES")
         
     except Exception as e: