My Taco Bell receipt says free crunchy taco with your next purchase, if you complete the survey at www.talktotacobell.co.nz
The branding of this being the same as for KFC and Pizza Hut, as well as by completing the survey and checking my code, I can conclude that the code generation is the same.
This means that null000llun's code generator should generate you a valid code for a free taco, all you need to do is tell the cashier your code! (when in level 2 I guess, not long now eh). Get your code here: https://null000.github.io/pizza-generator/
I don't think you can order online (except uber eats where you wouldn't be able to enter the code), which means the only way is to ask for it in-person (or over the phone?).
Chur
from memory, doesn't the cashier usually require a receipt? Does that mean drive-thru only?