The following settings must be completed before you are able to sync the orders:
2.1. In the ShipOut OMS system, click the portrait icon in the upper right corner > Selling channel > Connect a store or marketplace > Wayfair
2.6. ShipOut will send Wayfair the inventory synchronization data that has been tested. After that, you must update the initial ticket to inform Wayfair that your Inventory test Feed has been completed, as well as request production application approval.
2.7. Wayfair will authorize your application in the formal environment after confirmation, and you can use it officially after authorization.
Notes:
3.3 Set a shipping automation rule for this shipping service group: Shipping service settings > Shipping automation > Create shipping rules, choose ‘bill by 3rd party > Apply