Create Credit memo using API in Magento 2

Question

I am using the console command to delete an order item so I need also to create a credit memo based on the delete item price and refund the payment to the customer online using API.

I used the following API to credit memo of particular order ITEM based on the order ID:

ENDPOINT: https://dev.com/rest/V1/invoice/{Invoice ID}/refund

{
  "items": [
    {
      "order_item_id": {Order Item ID},
      "qty": 1
    }
  ],
  "notify": true,
  "arguments": {
    "shipping_amount": 0,
    "adjustment_positive": 0,
    "adjustment_negative": 0,
    "extension_attributes": {
      "return_to_stock_items": [
        1
      ]
    }
  }
}

When I send the API request it is throwing an issue of

  {
        "message": "Creditmemo Document Validation Error (s): \ n The back-to-warehouse argument contains a product item that is not part of the original order.",
        "trace": "# 0/home/dev/public_html/vendor/magento/framework/Interception/Interceptor.php(58): Magento\\Sales\\Model\\RefundInvoice->execute(91371, Array, false, true, false, NULL, Object(Magento\\Sales\\Model\\Order\\Creditmemo\\CreationArguments))\n#1
/home/dev/public_html/pub/index.php(28): Magento\\Framework\\App\\Bootstrap->run(Object(Magento\\Framework\\App\\Http\\Interceptor))\n#15 {main}"
    }

Can you please help me with how to create a credit Memo using API of a particular order?

Answer 1

If, as you wrote, already deleted order item, then you can not refund that order. There is tables sales_order and sales_order_item. In sales_order_item there is order items (that as you say deleted). So order do not have order items anymore. And without order items, you won't be able to create credit memo. That error part tell you that already

The back-to-warehouse argument contains a product item that is not part of the original order.

I don't know why you delete item first. Do not do that. Just create credit memo and magento will do rest.