add(docs): details on 'credit' and 'request' method responses

apps/docs/pages/guide/credit.mdx

@@ -28,4 +28,15 @@ app.get('/purchase', async (req, res) => {
 });
 
 
-```
+```
+
+The `credit` method returns a `PaymentInfo` object. It'll return these details:
+
+- **`transactionId`:** This identifier is obtained from the vendor's transaction ID. It uniquely identifies the transaction in the vendor's system.
+
+- **`paymentStatus`:** The payment status is also retrieved from the vendor's response. It indicates the current status of the payment transaction in the vendor's system.
+
+- **`referenceId`:** The reference ID is specific to Marupay and is provided in Marupay's response. It serves as a unique identifier for the transaction within Marupay's system.
+
+These details are essential for tracking and reconciling transactions between your application, the vendor, and Marupay. Ensure that you appropriately handle and store these values for accurate record-keeping and future reference.
+

apps/docs/pages/guide/purchase.mdx

@@ -23,5 +23,14 @@ app.get('/credit', async (req, res) => {
     }
 });
 
+```
 
-```
+It'll return the same response detail as from [`credit`](credit.mdx) method `PaymentInfo` object: 
+
+- **`transactionId`**
+
+- **`paymentStatus`**
+
+- **`referenceId`**
+
+Feel free to incorporate these details into your application's logic based on your specific use case and requirements.