Magento 2 Invoice Rest API – Online Refund Payment Process

There are some orders on the website that is done by the Paypal online method. Now I want to a partial refund of an order item using the invoice API.

E.g:: /rest/default/V1/invoice/xxxx/refund

{
  "items": [
    {
      "order_item_id": 20389,
      "qty": 1
    }
  ],
  "is_online": true,
  "notify": true,
  "arguments": {
    "shipping_amount": 0,
    "adjustment_positive": 0,
    "adjustment_negative": 0,
    "extension_attributes": {
      "return_to_stock_items": [
        1
      ]
    }
  }
}

It is throwing an issue of the Creditmemo Document Validation Error(s):\ The return to stock argument contains a product item that is not part of the original order.

I checked the database of the sale_order_items it is there same order Items id based on the order.

If I follow the blog link: https://www.rakeshjesadiya.com/create-creditmemo-for-order-item-in-magento-2/

Then it does the offline refund, not the online refund.

Can anyone guide how it is possible to do an online refund either using the script or using the API?