Hi @JuliaCH ,
Thank you for getting in touch. If you are using Shopify Payments to accept card payments in the UK, either online or in person, you will not pay transaction fees. There are different card processing fees depending on what your plan is, and whether you’re selling in person or online, which are detailed on our UK pricing page.
As an example, if you were using our Basic plan ($29 USD p/m) then you would pay 2.2% + 20p for a credit card transaction processed online with Shopify Payments, whereas the in-person rate would be 1.7% + 0p. The in-person rate applies to both credit and debit cards, and these fees are dependent on which subscription you have for your Shopify store, not which retail plan you are using (POS Lite or POS Pro). You can view a breakdown of the differences between POS Lite and POS Pro on the Shopify Help Center.
If you’d like to tell me what sort of business you run, I’d be happy to discuss our POS options and going into more detail about the features we offer. Please also let me know if you have any other questions.