Returns Order - Omisell Developer Portal | API Documentation & Integration Guides

2. Update API "Get Return Order Detail"

Update at: 03/09/2025

Link doc: https://developers.omisell.com/api-5184514

Add field "omisell_shipment_number", "wms_order_number", "vendor_return_id" for return_inventory_items level.

{
    "......": "......",
    "seller_id": 0,
    "shop_id": 0,
    "shop_name": "string",
    "return_inventory_items": [
        {
            "......": "......",
            "omisell_shipment_number": "string",
            "wms_order_number": "string",
            "......": "......",
            "vendor_return_id": 0,
            "......": "......"
        }
    ],
    "......": "......"
}

1. Update API "Get Return Order Detail"

Update at: 24/04/2025

Link doc: https://developers.omisell.com/api-5184514

Add field "fail_reason_type". The value of field "fail_reason_type" is defined in this link

{
    "......": "......",
    "fail_reason": "string",
    "fail_reason_type": "string",
    "......": "......"
}

3. `omisell_order_return_number` renamed to `omisell_return_order_number`

Update at: 02/09/2026

Endpoint: Get Order Return Revenue — https://developers.omisell.com/api-4376545

order_return.omisell_order_return_number is now
order_return.omisell_return_order_number, the spelling every other returns
endpoint already used (Get Returns Order List, Get Return Order Detail, Add
Order Return, the returns webhook). The value is unchanged — the Omisell return
code, e.g. RTNVN26081234ABCDEF.

WARNING

This is a rename, not an alias: the old key is gone from the response. If
your integration reads omisell_order_return_number from this endpoint, update
it. Everywhere else the field was already named omisell_return_order_number,
so nothing else changes.

Orders return

2. Update API "Get Return Order Detail"#

1. Update API "Get Return Order Detail"#

3. omisell_order_return_number renamed to omisell_return_order_number#

2. Update API "Get Return Order Detail"

1. Update API "Get Return Order Detail"

3. `omisell_order_return_number` renamed to `omisell_return_order_number`