This 2-4% being thrown around appears to be incorrect, as @dan1234 pointed out elsewhere here. The Mastarcard fees appear to be 0.2%-1.65% as per https://www.m

This 2-4% being thrown around appears to be incorrect, as @dan1234 pointed out elsewhere here. The Mastarcard fees appear to be 0.2%-1.65% as per https://www.mastercard.co.uk/en-gb/about-mastercard/what-we-do/interchange.html https://www.mastercard.co.uk/en-gb/about-mastercard/what-we-...