To sell on eBay, you need to register and create a new seller account. During this one-time process, you need to provide information to verify your identity and select how you'll pay your eBay seller fees.
You can verify your identity and pay your eBay fees by PayPal or credit card. After you choose your preferred method for verification, it will be set up as your default eBay fee payment method, however, you'll also be able to change it later.
Once you are verified, your account will be ready to sell, and you will be able to publish products using Printify.
Learn more about creating an eBay seller account here.