{"errors":{"fulfillment":"Required parameter missing or invalid"}}

[BartJR]

Good afternoon,

I am trying to create a fulfilment through the REST API, but keep getting this response:

{"errors":{"fulfillment":"Required parameter missing or invalid"}}

Path:

/admin/api/2021-04/orders/4019382714537/fulfillments.json 

My request:

{
    "fulfillment": 
    { 
        "order_id": 4019382714537,
        "location_id": 61798908073,
        "tracking_company": "DHL Express"
        "tracking_numbers": [123456789],
        "notify_customer": true,
        
    }
}

Headers:

I'm not sure what I'm doing wrong. Hope someone is able to help me out with this.