You want to create a fulfillment. You should be POSTing to /admin/api/2023-01/fulfillments.json https://shopify.dev/docs/api/admin-rest/2023-04/resources/fulfillment

Are you trying to see the fulfillment_orders for a particular order? If so that would be GET not POST. If you are trying to take some action on a fulfillment_order the  use the documentation below for the various endpoints for a fulfillment_order htt...

Are you using /admin/api/2023-01/order/{internal_order_id}fulfillment_orders.json When I replied I copied and mistakenly just moved the order_id parameter . /admin/api/2023-01/orders/{internal_order_id}fulfillment_orders/ = bad url/admin/api/2023-01/...

It should be /admin/api/2023-01/orders/{internal_order_id}fulfillment_orders/I think you should get a 404 with /admin/api/2023-01/orders/fulfillment_orders/{internal_order_id} or perhaps its blank due to needing the correct scope.

Glad that worked out and hope it helps everyone else making this change. I reckon it has to do with not setting up as a fulfillment service. That would make the fulfillment orders generated merchant managed.

Glad to help. Seems the response is a bug as it should warn of scope assignment issue but does not do so.

I do not believe the Fulfillment Service is necessary but the correct scopes are in order to see the fulfillment orders. Double check the scopes you have assigned. Assigned fulfillment ordersMerchant-manged fulfillment ordersthird-party fulfillment o...

Doesn't this have something to do with the assigned scopes?Its either Assigned fulfillment orders or Merchant-manged fulfillment orders or third-party fulfillment orders.

Strike using assigned_fulfillment_orders - it requires a Fulfillment Service.

Your proposed new flow seems close to what I'm starting to arrive at. We're a bit of order management but more a 3PL. While we might technically be a candidate to implement the entire FulfillmentService workflow it is a bit more than we tend to need ...

I'm also struggling a bit to wrap my head around the fulfillment orders and which way to implement handling them. Currently, we have subscribed to the orders/created, edit, paid and cancelled webhooks and build the order for our end using the order d...