Initiate a return request on a Shopify order and approve it using the returnRequest and returnApproveRequest Admin GraphQL mutations

In-depth guide

Steps

1. Call `returnRequest(input: { orderId: $orderId, returnLineItems: [{ fulfillmentLineItemId: $lineItemId, quantity: 1, returnReason: SIZE_TOO_SMALL, customerNote: "Wrong size" }] })` to create a return in REQUESTED status
2. Inspect the returned `return.id` and `return.status` (should be `REQUESTED`) and surface this to the merchant's review queue
3. Call `returnApproveRequest(input: { id: $returnId })` to approve the return; on success the `return.status` transitions to `OPEN` and the merchant can proceed with reverse logistics
4. Optionally create a reverse delivery (return shipping label) after approval using `returnCreate` with a `returnShippingAddress` and tracking information if your app manages labels
5. Once the returned item is physically received, call `returnClose(id: $returnId)` to mark the return as received before issuing a refund
6. Issue the refund with `refundCreate`, specifying `refundLineItems` and `transactions` to return payment to the original payment method or as store credit