Allow > 1 intervals
Created by: wpf500
I noticed that the $interval_interval
is ~never used~~ (correction: is used to update the ContributionRecur
record, but not sent to GC), at the moment this means that if a recurring contribution was supposed to occur once every 2 months, it would still be set up in GoCardless at once a month.
This PR adds interval
support (renamed from interval_interval
for consistency), and checks that the interval that has been specified isn't greater than a year (which isn't allowed with direct debits)