How to update fulfillment information for a FulfillmentOrder

[danielp1]

Hello,

I am looking at the REST api and for the life of me cannot find how to send the tracking number for a given FulfillmentOrder back to the mechant.

My steps:
I created a FulfillmentService (https://shopify.dev/api/admin-rest/2022-04/resources/fulfillmentservice#top) for my application, sent a FulfillmentRequest (https://shopify.dev/api/admin-rest/2022-04/resources/fulfillmentrequest#top) to the application, then I went ahead and accepted it. 

But what do I do after that? The only resource that I see that makes sense to use is Fulfillment but it says it will be deprecated soon (https://shopify.dev/api/admin-rest/2022-04/resources/fulfillment#top)

Any help is greatly appreciated!