BKexperience
You need a recent Burger King receipt to earn a free Whopper code. Go to MyBKExperience.com, type in the restaurant number and survey code on your receipt, and fill out the short survey. When you're done with the survey, you'll get a coupon that lets you get a free sandwich. This code is usually good for about 30 days.
https://mybkexperience.dev/questions/
https://www.ted.com/profiles/50901466
https://graph.org/BKexperience-01-03