Marks items in a fulfillment order as fulfilled and creates a shipment.

Line Item Status Requirements

Only items in pending status (open or allocated) can be fulfilled:

• ✅ open - Item awaiting allocation
• ✅ allocated - Item assigned to a location
• ❌ fulfilled - Already fulfilled
• ❌ cancelled - Cannot be fulfilled
• ❌ closed - Cannot be fulfilled

Fulfillment Process

When you fulfill an order:

1. Validates that requested line items exist and are in pending status
2. Validates that requested quantities don't exceed available quantities
3. Creates a shipment (unless skip_shipping=true)
4. Marks line items as fulfilled with a unique fulfillment ID
5. Updates order status based on overall fulfillment progress
6. Triggers webhooks

Line Items (Required)

You must provide line_items array specifying which items to fulfill:

• Each item needs id matching an order line item
• Each item needs quantity to fulfill (must be ≤ pending quantity)

Shipment Creation

Control shipment creation with query parameters:

• create_draft_shipment=true: Creates a draft shipment for review before carrier booking
• skip_shipping=true: Fulfills without creating any shipment (items auto-close)

Inventory Impact

If inventory management is enabled with stock_reduction_timing = ON_ORDER_FULFILLED:

• on_hand is reduced by the fulfilled quantity
• reserved is reduced by the fulfilled quantity

If shipping is not required (or skip_shipping=true), items are automatically set to closed status.