I have created a coupon and gave if a 100% rate, so i can use to test services etc.
i also have a tax rate of 4.5% as a processing fee, but adding the coupon only takes into account the plan rate and not the tax, so a plan at £1.50 will at a 7p tax (£1.57) but using the coupon for 100% removes the £1.50, but leaves the 7p as payable
how can i get this to be 100% in total discount