Stripe minimum charge amounts applied

[remcotolsma]

In MemberPress version 1.11.7 minimum charge amounts have been introduced:

1.11.7 – 2023-07-10

Fixed

• Round up to Stripe's minimum charge for each currency if checkout amount is less than minimum allowed by Stripe

• ebe66b5#diff-7f7c2a34f5dc7d658b5a1b7b13b05595b5f721f0773ca9708b15ee5e67869138

Unfortunately, as MemberPress applies these minimum amounts per currency, this change also applies to third-party gateways. This results in for example a payment of € 0,50 for a membership with a trial amount of only € 0,02.

There is a filter mepr_minimum_charge_amounts in https://github.com/pronamic/memberpress/blob/v1.11.7/app/data/minimum_charge_amounts.php, but as far as I can see it is not possible or would be difficult to change the minimum charge based on the selected gateway — the product title in the screenshot for example is not updated when selecting a different payment method.

The easiest way to complete opt-out of the Stripe minimum charge amounts is by adding this filter:

\add_filter( 'mepr_minimum_charge_amounts', '__return_empty_array' );

Internal Help Scout ticket: https://secure.helpscout.net/conversation/2392565894/26308

Originally posted by @rvdsteege in pronamic/wp-pronamic-pay-memberpress#16