Not including VAT on specific payment type

Hi Team,

UAE has recently introduced VAT which has been setup and is is working fine. The problem I am facing is that for 2017 Groupon offers being used in 2018, a tax is being included.

I had setup a Groupon account to track and a payment option of Groupon to track the same. The problem is that when Groupon product is being selected, the ticket is showing a tax which should not be payable by customer.

The issue is when a customer orders additional products that TAX is applied in addition to the Groupon voucher previously paid for, which does not have VAT.

Hope I make sense.

Thank you in advance for the help!!