Automatically adding a % fee to a basket

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Hello all

We have been successfully running a Shopify store for a few years and have just set up a second to operate as our B2B for selling to trade (B2B).

on our B2C website, just like everyone else we are happy to pay the 2% + 20p transaction fee for taking payments via Shopify pay. But over on our new B2B website, we want to encourage our trade customers to pay via bank transfer and to discourage them from paying with credit card. 

is there a way to automatically add a 2% credit card processing fee at checkout if they choose to pay by credit card? 

thank you