If you would like to add Tips, Please follow the steps below:
Tap on "Home" and Chose your preferred Merchant
After finish choosing the items you need , tap "Checkout"
Scroll down till you see "Tips"
Choose the amount you like to give or alternatively you can key in the amount you preferred by tapping on "Other" after Finished tap on "Checkout"
Remember to check your order summary details, once confirmed tap on "Confirm" and your order will be placed.