How to send order info to a fulfillment service API?

Shopify Partner
14 0 7


I need to send order information to a fulfillment service that has an API.
I'd just like to understand how to go about it.
I've looked at the doc and I'm a bit lost:

1) Is it mandatory to create an App?


2) Does the app have to be hosted on a dedicated server?


3) Is it necessary to create a custom App, and if so, should it be hosted on a dedicated server or can it be hosted on your Shopify site?


Thanks a lot!

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