You need to upgrade your API version to 2022-07 or better still 2022-10.
I assume you have fulfillment service and all the inventories are in the location created by your fulfillment service.
Let's say you want to fulfill a shopify order with Order Id: 4534463334556
1) Send get request to
https://your-store-name.myshopify.com/admin/api/2022-10/orders/4534463334556/fulfillment_orders.json
You will get list of fulfillment orders for the shopify order 4534463334556
2)
If fulfillment order exists, loop through each fulfillment order and if status of the “request_status” is “unsubmitted”, you will submit fulfillment request:
https:// your-store-name,myshopify.com/admin/api/2022-10/fulfillment_orders/5787678983/fulfillment_request.json
5787678983 = $fulfillment_order_id
Post Data:
array('fulfillment_request'=>array('message'=>$message,
'fulfillment_order_line_items'=>array()) );
Note: Post data has to be in json format and text with $ sign needs to be replaced with actual value.
3)
If the request submission returns success, you need to accept the fulfillment request.
Post Request URL: https:// your-store-name,myshopify.com/admin/api/2022-10/fulfillment_orders/$fulfillment_order_id/fulfillment_request/accept.json
Post Data:
'{"fulfillment_request":{"message":"$custom_message."}}'
4) Finally create fulfillment(s) for the fulfillment order.
Post Request URL: https:// your-store-name.myshopify.com /admin/api/2022-07/fulfillments.json
Post data Json:
{"fulfillment":{"message":"Package Shipped","notify_customer":"","tracking_info"
:{"url":":\/\/mytrackingurl.com\/trackid","company":" Tracking company name","nu
mber":""},"line_items_by_fulfillment_order":[{"fulfillment_order_id":null,"fulfi
llment_order_line_items":[]}]}}
If all the details are good, the order will automatically be fulfilled.
