How do I resolve a FulfillmentRequest API error in my custom app?

Shopify Partner
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Dear all: What's up everyone?
When utilizing the FulfillmentRequest APIs, I have a problem.
I have developed a customized app where I want to list the orders generated for the products within the app. All orders are successfully listed.

However, I want to change the order's status once the confirm button has been clicked.

I'm using the file fulfillment_request.json at /admin/api/2023-10/fulfillment_orders/1046000829.

, and I got

"errors": [

"The fulfillment order's assigned fulfillment service must be of api type"



This error.If someone can assist me in resolving this problem, please let me know.
Here is the documentation:
Greetings and many thanks to all.



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