diff --git a/src/main/java/com/example/zarinpal/data/remote/dto/unVerified/PaymentUnVerifiedRequest.kt b/src/main/java/com/example/zarinpal/data/remote/dto/unVerified/PaymentUnVerifiedRequest.kt
index 2641356..d5aa62e 100644
--- a/src/main/java/com/example/zarinpal/data/remote/dto/unVerified/PaymentUnVerifiedRequest.kt
+++ b/src/main/java/com/example/zarinpal/data/remote/dto/unVerified/PaymentUnVerifiedRequest.kt
@@ -1,3 +1,4 @@
+
 package com.example.zarinpal.data.remote.dto.unVerified
 
 import com.example.zarinpal.data.remote.dto.Config
@@ -5,25 +6,28 @@ import kotlinx.serialization.SerialName
 import kotlinx.serialization.Serializable
 
 /**
- * Request payload for unverified payment operations.
+ * Represents the request data required for unverified payment transactions.
  *
- * @property merchantId Optional merchant ID; identifies the merchant making the request.
- * @property sandBox Optional flag to indicate if the request is in sandbox (test) mode.
+ * @property merchantId The unique identifier for the merchant (nullable).
+ * @property sandBox Indicates if the request should be processed in sandbox mode (test mode).
  */
 @Serializable
 data class PaymentUnVerifiedRequest(
     @SerialName("merchant_id")
-    val merchantId: String? = null,
-    val sandBox: Boolean? = null
-) {
+    val merchantId: String?=null,
+    val sandBox :Boolean?=null,
+){
     /**
-     * Returns a new instance with missing fields populated from the provided [config].
+     * Creates a copy of the request with the merchantId and sandBox values
+     * replaced by the ones from the provided [Config] if they are null.
      *
-     * @param config Configuration supplying default values.
-     * @return Updated [PaymentUnVerifiedRequest] instance.
+     * @param config The [Config] object that provides default values for merchantId and sandBox.
+     * @return A new instance of [PaymentUnVerifiedRequest] with updated values.
      */
-    fun copyWithConfig(config: Config): PaymentUnVerifiedRequest = copy(
-        merchantId = merchantId ?: config.merchantId,
-        sandBox = sandBox ?: config.sandBox
-    )
+    fun copyWithConfig(config: Config): PaymentUnVerifiedRequest {
+        return this.copy(
+            merchantId = this.merchantId ?: config.merchantId,
+            sandBox = this.sandBox ?: config.sandBox
+        )
+    }
 }