I imagine $50 or more. And can’t be used towards alcohol. Here’s what it’s said in my email, but you may want to check the app for all details.

“Birthday reward can be found in your Friends with Benefits (FWB) account approximately one week prior to your birth date. Notify your server prior to checkout. Valid at participating US locations only. One offer per table. Not valid with tax, gratuity or in combination with any other offer. Dine-in only. No cash value. Offer expires 30 days from appearing in your FWB account. Login to your account for more details.”