To sync all past orders orders:
1. Click "Settings" located in the left side menu.
2. Click "Integrations" located in the left menu.
3. Click the integration you wish to sync historical data for.
4. Click the "Sync Historial Data" button.
Past orders from the connected ecommerce store will sync to your account. Synced historical data will not trigger any automations to run that use the "Makes a purchase" automation trigger.