Initiate a Shopify return with returnCreate, create a reverse delivery, and issue a partial refund

In-depth guide

Steps

1. Query the order for fulfillment GIDs and line item quantities using the order GraphQL query, then identify eligible lines for return
2. Call the returnCreate mutation with the fulfillmentLineItems array specifying quantity and returnReason for each line
3. After the return is created, call reverseDeliveryCreateWithShipping mutation with the return GID to generate a return shipping label and associate tracking
4. Once the return is received, call reverseFulfillmentOrderDispose mutation to mark each line as restocked or not-restocked based on condition inspection
5. Issue the refund by calling refundCreate with the refund line items, shipping amount if applicable, and transactions referencing the original payment gateway transaction