Shopify fulfillment_order API doesn't return any result

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Hi all,

In my shop I have configured the order creation webhook that calls an API to send an email with the split of the order based on the location that has the product in inventory.
To do this I called this API with the order number created.

I tested the operation in a test shop where I had Bogus as a payment system. And everything worked.
Now when I try it in the final store where I set up shopify payments in test mode, this same call returns no results.
What could be due to this different type of operation?

Thank you so much for your help.