ShipStation Integration
How Send To Many orders flow into ShipStation for fulfillment. Recipient orders import automatically while aggregate orders need to be filtered out.
Send To Many generates standard Shopify orders for each recipient, so they flow into ShipStation just like any other order. The main thing to configure is filtering out aggregate orders (the parent orders that capture payment but don't ship anything) so they don't clutter your fulfillment queue.
ShipStation typically skips aggregate orders automatically since they're marked "Does not require shipping," but setting up an automation rule as a backup filter is good practice. You can also configure order tags, shipping method mapping, and notification settings to make fulfillment seamless.
→ See the tutorial: ShipStation + Send To Many: Fulfill Bulk Orders from Shopify