Fix fulfilment service endpoints

[long-blade]

Fulfillment endpoints removed from the REST Admin API

As of API version 2022-07, the following endpoints have been removed from the Fulfillment resource in the REST Admin API:

/orders/{order_id}/fulfillments.json
/orders/{order_id}/fulfillments/{fulfillment_id}.json
/orders/{order_id}/fulfillments/{fulfillment_id}/complete.json
/orders/{order_id}/fulfillments/{fulfillment_id}/open.json
/orders/{order_id}/fulfillments/{fulfillment_id}/cancel.json

Use the FulfillmentOrder resource instead.

Removes

FulfillmentService.php

• - update()
• - complete()
• - open()

---

Additions

FulfillmentService.php

• updateTracking() endpoint
  FulfillmentFields
• tracking_info property
• line_items_by_fulfillment_order property

---

Fixes

FulfillmentService.php

• cancel order endpoint

[long-blade]

@chewlim can you please review this MR? It is crucial for Shopify applications, by the end of this month the old way will not be able to work