HURRY! Score $25 of Free Food from Postmates with the code HOWDYCMA for a limited time. Add the code to your account now before it is gone. If it doesn’t work on the website, try on the app. Scroll down for a few more codes to save $$$ on your next purchases. To add a code to your Postmates account, open the app, tap on Account, then Promotions and enter the promo code at the top.