DOCS-3893:Add Credit invoice and refund feature

Author: Rendani-MultiSafepay

content/payment-methods/e-invoicing.md

@@ -288,7 +288,9 @@ The invoice is sent to the email address provided.
 --header 'Cookie: PHPSESSID=0ehsns7asf0vgarhlf77d1ac17'
 ```
 
+5. In response to refund invoice request, you receive an object including a PDF encoded in `base_64`. 
 
+6. To convert the `base_64` to a PDF, you need to pass the `base_64` to a converter.
 
 </details>
 
@@ -306,10 +308,12 @@ The invoice is sent to the email address provided.
 
 --header 'Cookie: PHPSESSID=0ehsns7asf0vgarhlf77d1ac17'
 ```
+3. In response to refund invoice request, you receive an object including a PDF encoded in `base_64`. 
 
-</details>
+4. To convert the `base_64` to a PDF, you need to pass the `base_64` to a converter.
 
 ---
+</details>
 
 </details>
 
@@ -359,17 +363,6 @@ See API reference – [Refund order](/reference/refundorder).
 
 ---
 
-</details>
-<details id="how-to-refund-an-order">
-<summary>How to refund an order with checkout data</summary>
-<br>
-
-1. [Get order](/reference/getorder) 
-2. From the response, copy the `shopping cart`.
-3. In [Refund order](/reference/refundorder) request, paste `checkout_data.items`
-4. From the `checkout_data.items`, duplicate the `item` you want to do a refund and add a negative (-) to the `quantity` amount. 
-5. Send the request. 
-
 </details>
 
 ## Shipment