contribution (Stripe payment) fails when percentage field is enabled

[MtnPavlas]

Cross-posting here as I'm not sure if it's % field or Stripe Pmt extension or CiviCRM core issue : (

https://lab.civicrm.org/extensions/stripe/-/issues/465

Thank you so much for any pointers.

[kcristiano]

adding my notes - https://lab.civicrm.org/extensions/stripe/-/issues/465#note_162573

[konadave]

CRM.percentagepricesetfield..calculateTotalFee doesn't take into account the hidden $1 price attached to the checkbox for the % fee. For example, a $100 donation + 3.5% fee is being calculated as $101 + 3.5% = $104.54.

Should the price option on the checkbox have an amount of $1.00 ? Setting it to $0.00 causes the UI to calculate the fee properly but I don't know what other side effects there are.

I have a code fix that subs out the extra $1 from baseTotal that seems to fix the issue.