Why am I getting a 'Not Found' error when fulfilling an order via API?

[madamror]

I'm trying to fulfill an order (with all of its items) from the API

curl -d '{"fulfillment":{"line_items_by_fulfillment_order":[{"fulfillment_order_id":1234}],"tracking_info":{"number":"MS1562678","url":"https://www.my-shipping-company.com?tracking_number=MS1562678"}}}' \
-X POST "https://my-store.myshopify.com/admin/api/2022-04/fulfillments.json" \
-H "X-Shopify-Access-Token: xxxxx" \
-H "Content-Type: application/json"

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The response is 

{"errors": "Not Found"}

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What am I missing?

[magecomp]

Hello @madamror 

• Check the fulfillment order ID you are using to make sure it is correct.
• Check the Shopify admin to see if the fulfillment order has been created.
• Check the Shopify admin to see if the fulfillment order has been deleted.

If you have checked all of these things and you are still getting the error message "Not Found", you can contact Shopify support for help.