Automate pick-pack-ship workflows in ShipStation by pushing order data via API, triggering fulfillment, and syncing tracking back to the originating marketplace

Steps

1. POST new orders to the ShipStation Orders API endpoint with all required fields: orderNumber, orderDate, billTo, shipTo, items array with SKU and quantity, and orderStatus set to awaiting_shipment
2. Configure ShipStation automation rules in the dashboard (or via the API's automationrules endpoint) to assign orders to the correct warehouse, carrier, and service based on weight, destination, or SKU tags
3. Poll GET /shipments with a createDateStart filter or subscribe to ShipStation webhooks for the SHIP_NOTIFY event to receive shipment confirmation with tracking numbers
4. Push the tracking number and carrier code back to the originating marketplace (Shopify, Amazon, eBay) using that platform's fulfillment API to mark the order as shipped
5. Handle partial shipments: ShipStation may create multiple shipments for a single order; ensure your sync logic handles a one-to-many order-to-shipment relationship
6. Reconcile daily using the GET /shipments endpoint with a date range filter to catch any shipments created manually in the ShipStation UI that were not delivered via webhook