diff --git a/ns_app/api/payments.py b/ns_app/api/payments.py
index c7c3ee7..6b27073 100644
--- a/ns_app/api/payments.py
+++ b/ns_app/api/payments.py
@@ -121,19 +121,18 @@ def call_payment_api(payload):
 def get_collect_checkout_url(invoice):
     inv = frappe.get_doc("Sales Invoice", invoice)
 
-    username = frappe.conf.get("nmi_username")
-    password = frappe.conf.get("nmi_password")
+    security_key = frappe.conf.get("nmi_security_key")
 
-    if not username or not password:
-        frappe.throw("NMI credentials not configured")
+    if not security_key:
+        frappe.throw("NMI security key not configured")
 
     return (
         "https://crystalclear.transactiongateway.com/collect/checkout"
-        f"?username={username}"
-        f"&password={password}"
+        f"?security_key={security_key}"
         f"&amount={inv.outstanding_amount}"
         f"&orderid={inv.name}"
     )
+    
 
 @frappe.whitelist(allow_guest=True)
 def crystalclear_webhook():