FulfillmentRequest in REST API

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I am from 3PL and our customer would like us to have integration with Shopify.

We are going to use Rest API

After studying the API doc, as per our understanding, the merchant (our customer) required to make a FulfillmentRequest and the request to pass to 3PL through the callback url setup in the FulfillmentService.

Then 3PL required to send an accept / reject request through mechant provided shop URL, authentication key & password
Is my understanding correct ?

What will be the json look like in the request to 3PL callback url ? Is it the same as the response of FulfillmentRequest ? Any specification about it ?