Shopify Return Orders Not Syncing Correctly

**Issue:**

We are facing an issue with the Shopify integration where **return orders created in Shopify are not being reflected correctly** in the system.

**Current Flow:**
When an order is created and fulfilled in Shopify, the system correctly creates the corresponding **Sales Order (SO)** and **Delivery Note (DN)** in ERPNext. However, when the order is **returned and restocked in Shopify**, the **Sales Return is not created** in ERPNext.

**Steps to Reproduce:**

1. Create an order in Shopify.
2. Fulfill the Shopify order.
3. Create a return for the order in Shopify and restock the products.
4. Observe that the **Sales Order and Delivery Note** are created for the Shopify order, but the **Sales Return is not created** in ERPNext.