Are there any transaction fees or other hidden fees I should worry about?
If you are using the Shopify card reader with Shopify Payments, you will pay only the credit card processing fee. If you accept any other type of payment on Shopify POS (e.g. cash, external debit, external credit etc.) you will not pay a transaction fee of any sort.
Common questions about Shopify
Everything you need to know before you get started