There should be tax calculation for individual store. The tax should be calculated on Sub total + restaurant charge - discount and not on including delivery charge.
For example an
item cost 100
restaurant charge is 10
discount is 5
delivery charge is 20
Tax rate for that restaurant is 5%
Tax should be calculate on (100+10-5) =105
Also there should be a option for admin discount coupon and restaurant discount coupon for marketing purpose.
Please lets have a discussion and implement this. Most of the restaurant charge gst on their bill and right we don't have any other option to add the price inclusive of tax this create problem with discount because discount is always calculated before tax.