Shopify supports the connection of the G2A payment gateway. The peculiarity is that the % for processing credit card transactions is quite low. Until 2017 the G2A gateway processed only payments for digital goods. Since 2017 it is possible to accept payments for physical goods as well.
To connect, you need to:
Make a request on the G2A integration page. You will have to send information about the company (or sole proprietorship) you are going to connect in order for the documents to be considered. Usually consideration takes 2-3 weeks.
As G2A payment gateway works in Europe, you will have to temporarily specify the European registration address in the Shopify settings. Please refer to the instructions.
Link for connecting G2A payment gateway to Shopify store.