Below you will find helpful links surrounding Merch by Amazon
Merch by Amazon Knowledge Base
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Can I link my Merch by Amazon account to Seller Central?
Why are some of my shirt sizes showing as Currently Unavailable?
07/20: Announcement: T-shirts showing as "Pending Your Approval"
Another Merch seller stealing my design and using it on a T-Shirt
ANNOUNCEMENT 9/10/2019 - Saved Setting Feature Live