$20 of free food with Tab Payments [TORONTO/MTL]

Hi guys, there's a relatively new app I've been using to dine with called Tab Payments. https://tabpayments.co/ The app allows you to pay for dinner/lunch through your phone. You can also do split billing through the app however it will be split evenly. If you download the app and and enter the promo code: TABVOONG (after you've made an account) you'll get a $20 credit applied to your account. Basically you open the app and check-in to the restaurant. Then you'll open a "New Tab" (friends can join your tab) & tell the waiter that you'll be paying with the Tab app. They'll send the bill to your app and you can jut leave when you're done eating. The one flaw is that there is no detailed billing and you don't receive your actual bill aside from the amount you paid + tax + tip. Eg. you dine with 3 people and bill is 90$+tax+tip. Your app would show that you paid $36.90 -- $30-food, $3.90-tax, $3-tip. There's about 90 restaurants in Toronto and 20 in Montreal.