put https://marketplace-api.fabric.inc/v1/retailers//invoices//acknowledge/
Retailers, generally, include is_acknowledged=0 as a query string parameter to get only new invoices. Then, for each shipment returned, the retailer should process the shipment and update any necessary internal systems (such as OMS or ERP). After processing a shipment successfully, the retailer should acknowledge the shipment using this endpoint so that subsequent queries to the /shipments/?is_acknowledged=0 endpoing does not return processed shipments.