Yes, Amazon Channel connects your online store to your Amazon selling account. You need an Amazon Professional Seller account (you can't use an individual account because Amazon doesn't provide a way for integration solutions to communicate with your account, only Professional accounts allow this).

Learn more about Amazon Professional Seller Accounts.

You are responsible for any Amazon charges - these are separate to any Amazon by Codisto app charges (Amazon Channel by Codisto paid plans) billed through Shopify.