Step 7. Make the additional website to be the Sales Channel for additional stock [Web API Tutorial]

Endpoint
PUT http://<host>/rest/all/V1/inventory/stocks/2

Headers
Content-Type application/json
Authorization: Bearer <admin_token>

Payload

{
  "stock": {
    "stock_id": 2,
    "name": "Stock 2",
    "extension_attributes": {
      "sales_channels": [
        {
          "type": "website",
          "code": "test"
        }
      ]
    }
  }
}

Response

Complete cURL request

curl -X PUT "$endpoint/all/V1/inventory/stocks/$stock_id_2" \
 -H 'Content-Type: application/json' \
 -H "Authorization: Bearer $admin_token" \
 -d '{"stock":{"stock_id":"'"$stock_id_2"'","name":"'"$stock_name_2"'","extension_attributes":{"sales_channels":[{"type":"website","code":"test"}]}}}'