Fulfilling a particular line item through the REST API

Shopify Apps
1

Hello. I am trying to fulfill a specific line item in an order through the REST API. I am using the fulfillments.json endpoint and my payload is like this

[
  'fulfillment' => [
    'message' => 'Fulfill Attempt',
    'notify_customer' => true,
    'tracking_info' => [
      'number' => '{SOME_NUMBER}',
      'url' => '{SOME_TRACKING_URL}',
      'company' => '{COMPANY}',
    ],
    'line_items_by_fulfillment_order' => [ 
      [
        'fulfillment_order_id' => 6103291298038,
        'line_item_id' => 12707794977014,
        'quantity' => 1,
      ], [
        'fulfillment_order_id' => 6103291298038,
        'line_item_id' => 12707795075318,
        'quantity' => 0,
      ], [
        'fulfillment_order_id' => 6103291298038,
        'line_item_id' => 12707795108086,
        'quantity' => 0,
      ],
    ],
  ],
]

The problem is, Shopify API is marking all three line items as fulfilled even though I am passing the proper line item id (The one that I don’t want fulfilled) and quantity as 0. My guess is, because I am passing the fulfillment_order_id parameter which is the same for all 3 items, Shopify is marking them fulfilled. I checked on the Shopify Admin panel. There you can partially fulfill a line item by marking the rest of the line items as 0 out of 1.

Am I missing something in the API? Please help.

2

@SidSjv You shouldn’t include line items which you don’t want to fulfill at all on this request.
Meaning if you have fulfillmen t request of 3 line items and you want to fulfill only 2 which means that those 2 items will be sent in the same package you include only 2 items on your request.