Hello,
with the Coupons Extra Fields extension installed, I am trying to specify multiple categories for one coupon. This does not work (see before-save and after-save) attached.
I have also had a look at the database fields and it seems for_category_id is an int(11) field, which will only be able to hold a number and not a comma-separated amount of numbers.
Is my install wrong or is this a bug? What needs to be done to fix it?
Thanks.
after-save.png
PHP: