@Edent SumUp and Square pay out net daily. Stripe is the worst of both worlds; they pay out net daily but do have a flat fee plus percentage fee structure so it's possible for a small transaction to be completely eaten by fees.

(That's why, although Stripe have the best designed API for integration with POS systems, I don't support them in my POS system yet!)

@Edent The "traditional" card terminal providers like Barclaycard, Dojo, Worldpay and so on will have fee structures that incorporate a fixed "authorisation fee" and then a percentage of the payment which are likely to be different for each class of card (matrix of credit, debit, domestic, international, special case for Amex); they will happily process transactions that cost the merchant more than the transaction amount. They tend to pay out gross daily and then invoice fees monthly.

@Edent @davidgerard @duncanlock @tante SumUp's minimum payment amount in the UK is £1.

Their fees are rounded to a whole number of pennies per transaction using Banker's rounding (Round Half to Even).

@davidgerard @Edent @duncanlock Yes, the shop will have paid the transaction fee for this and it will have been a fairly large proportion of the payment.

Not as large in the UK as in the USA, but still a flat fee per transaction plus a percentage of the payment amount.

The payment providers that offer simple percentage pricing (eg. Square at 1.75% and SumUp at 1.69%) are able to do so because they insist on a minimum transaction amount of £1.