diff --git a/README.md b/README.md
new file mode 100644
index 0000000..6f91ef8
--- /dev/null
+++ b/README.md
@@ -0,0 +1,21 @@
+# SEP Payment Gateway Integration
+
+A simple Go implementation for integrating with SEP (Shaparak Electronic Payment) gateway.
+
+## Prerequisites
+
+- Go 1.21 or higher
+- Internet connection (for testing with SEP sandbox/production)
+
+## Configuration
+
+Before running the project, you need to configure the payment gateway credentials in `main.go`:
+
+```go
+config := service.Config{
+    PaymentGetToken:   "https://sep.shaparak.ir/OnlinePG/OnlinePG",
+    PaymentVerifyURL:  "https://sep.shaparak.ir/verifyTxnRandomSessionkey/ipg/VerifyTransaction",
+    PaymentReverseURL: "https://sep.shaparak.ir/verifyTxnRandomSessionkey/ipg/ReverseTransaction",
+    CallbackURL:       "http://localhost:8070/api/callback",
+    Credential:        "YOUR_TERMINAL_ID", // Replace with your Terminal ID
+}
\ No newline at end of file
diff --git a/main.go b/main.go
index 36ae2af..e314a14 100644
--- a/main.go
+++ b/main.go
@@ -10,7 +10,7 @@ func main() {
 		PaymentGetToken:  "https://sep.shaparak.ir/OnlinePG/OnlinePG",
 		PaymentVerifyURL: "https://sep.shaparak.ir/verifyTxnRandomSessionkey/ipg/VerifyTransaction",
 		CallbackURL:      "http://localhost:8070/api/callback",
-		Credential:       "15144433",
+		Credential:       "000000",
 	}
 
 	paymentSvc := service.NewPaymentService(config)