How do I find valid Lyft promo codes for 50$?

Well, 

Honestly, there is no lyft promo code that give you $50 dollars of on first ride. However, you can get up to $20 dollars of on first ride.

The code is : TEST20  to get up to $20 dollars off first ride.

Make sure you use the code before you take first ride and once you insert the code in the app section of your lyft app then make sure you take ride within 14 days.

Enjoy you ride……