Create a new fulfillment record for an order, indicating that one or more items have been shipped. The fulfillment typically includes the carrier name, tracking number, and the list of line items being fulfilled in this shipment. Creating a fulfillment often triggers shipping notification emails to the customer on supported platforms.

This endpoint is widely supported across EcartAPI's platform ecosystem and is a core part of post-order processing workflows.

Note: Required fields, carrier code formats, and notification behavior vary by platform.