API : https://api.bigcommerce.com/stores/{{STORE_HASH}}/v3/orders/{order_id}/payment_actions/refunds STORE_HASH – Obtained on Creating Client APIOrder_id – Order id of the sales orderRequest sample:POST https://api.bigcommerce.com/stores/{{STORE_HASH}}/v3/orders/{order_id}/payment_actions/refundsX-Auth-Token: {{ACCESS_TOKEN}}Content-Type: application/jsonAccept: application/json {“order_id”: 1234,“items”: [{“item_type”: “ORDER”, // Refund a tax-exempt custom amount“item_id”: 1234, // Order ID“amount”: 1, // Amount to refund}],“payments”: […]}