MBA - Merch By Amazon
Merch by Amazon is a platform that will do what is called print on demand - POD is a process where Amazon will take your design that you upload to various products and then offer for sale for you. When someone purchases your product Amazon will print and ship and handle all customer service for the sale. You will then received a royalty for the sale from Amazon. To become a member you apply and once your approval is complete you are able to start uploading designs onto various products. Amazon sells products in many countries. There are specific design criteria that has to be followed which is listed in the terms of service - TOS so you must follow these precisely.
This PDF - Merch by Amazon will give you more details about the MBA program. How to get started and once approved how to upload your product - photos/designs - onto various items.
You can buy this PDF at GumRoad for $8.95 – click below
Here are a few samples of my photos on various items on MBA(these are live links so items are available for sale).