Cannot fulfill order items through rest api

Shopify Partner
23 2 2

Hi everyone,


We are trying to fulfill order items by using fulfillment api with custom app credentials but the response is html, not json. May I ask how we can return as json like documentation. Thank you very much


Here is request payload

    "fulfillment": {
        "line_items_by_fulfillment_order": [
                "fulfillment_order_id": 6757436850239
        "location_id": "36162764863"

The result is in screenshot below




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