diff --git a/src/main/java/com/example/zarinpal/data/remote/dto/inquiry/PaymentInquiryRequest.kt b/src/main/java/com/example/zarinpal/data/remote/dto/inquiry/PaymentInquiryRequest.kt
index 378e79a..e80e809 100644
--- a/src/main/java/com/example/zarinpal/data/remote/dto/inquiry/PaymentInquiryRequest.kt
+++ b/src/main/java/com/example/zarinpal/data/remote/dto/inquiry/PaymentInquiryRequest.kt
@@ -1,3 +1,4 @@
+
 package com.example.zarinpal.data.remote.dto.inquiry
 
 import com.example.zarinpal.data.remote.dto.Config
@@ -5,26 +6,30 @@ import kotlinx.serialization.SerialName
 import kotlinx.serialization.Serializable
 
 /**
- * Request data for inquiring about a payment.
+ * Represents the request data required to inquire about a payment.
  *
- * @property merchantId Optional merchant identifier.
- * @property sandBox Indicates whether to use sandbox (test) mode.
- * @property authority Required payment authority code.
+ * @property merchantId The unique identifier for the merchant (nullable).
+ * @property sandBox Indicates if the payment inquiry should be processed in sandbox mode (test mode).
+ * @property authority The authorization code for the payment inquiry (required).
  */
 @Serializable
 data class PaymentInquiryRequest(
     @SerialName("merchant_id")
-    val merchantId: String? = null,
-    val sandBox: Boolean? = null,
-    val authority: String
-) {
-
+    val merchantId: String?=null,
+    val sandBox :Boolean?=null,
+    val authority :String,
+){
     /**
-     * Returns a copy of this request using fallback values from [config]
-     * if [merchantId] or [sandBox] are null.
+     * 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 The [Config] object that provides default values for merchantId and sandBox.
+     * @return A new instance of [PaymentInquiryRequest] with updated values.
      */
-    fun copyWithConfig(config: Config): PaymentInquiryRequest = copy(
-        merchantId = merchantId ?: config.merchantId,
-        sandBox = sandBox ?: config.sandBox
-    )
+    fun copyWithConfig(config: Config): PaymentInquiryRequest {
+        return this.copy(
+            merchantId = this.merchantId ?: config.merchantId,
+            sandBox = this.sandBox ?: config.sandBox
+        )
+    }
 }