Capability to capture Customer Birthday from Zenfoody OLO & Custom App for offering birthday promotions

Currenlty from Loyalty accounts visible in store and the back office there is a birthday field but no way for our customers to enter their birthday. We'd like to be able to capture customer birthdays on Zenfoody Online Ordering, and the Custom App, and  be able to offer Free drinks(or other discounts) on their brithday.

1. Custom App & Zenfoody Online Order should ask the customer to input their Birthday on sign up.
   1. If a customer has already signed up the app should ask them to input their Birthday on feature release.
2. Ability to tie discounts to the Customer Birthday fields for promotions
3. Push Notifications on Mobile App to notify the customer they have a birthday promotion available
4. Email notification to notify the customer they have a birthday promotion available