Retrieve all fulfillment records associated with a specific return. Returns fulfillments track the physical receipt and processing of returned items at the warehouse — including the items received, their condition, and the restocking or disposal outcome.

This endpoint is essential for building closed-loop reverse logistics workflows, where the system needs to confirm that returned items have been physically received before issuing refunds or restocking inventory.

Note: Returns fulfillment data is only available on platforms that model return receiving as a separate resource.