As long as you have been signing in through the same channel (Google, Facebook, or Apple) and the restaurant is currently signed up for Menufy's reward program, you will receive a reward balance approximately 3 hours after your 10th order for that specific Menufy restaurant only. The earned reward for each applicable order will be displayed at the top of the checkout page.
To redeem it, while placing your next order, log in via the same channel you've been using (Google, Apple, or Facebook) and on the Checkout page, check the box "Apply my full $__ reward" found below the payment methods area (see image below). All your rewards balance will be spent on that order. This means if the order total was $22 and the credit was for $25, the leftover $3 will be thrown out, so make sure to use it all!