Best Salon Check In

This application is part of a suite of applications for owners of small businesses that have stores and have daily visitors, such as nail salons, hair salons, or restaurants.

The only task of this application (Best Salon Check In) is to store customer check-in information, to:
1. Save the check-in history, serving gift programs of this business for this customer, for example: If the customer check in 5 times, the customer will receive a 10% discount.
2. If the customer does not come for a long time, based on the customer's last check-in, an email will remind the customer to visit the business.
3. On the customer's birthday, they will also be given gifts by the business, such as a free service or a 20% discount for them and their friends
So all function of this app is just to let customers checkin. The method of customer checking in need to be very simple, through which they just need to enter their phone number
Other information gathered from them are:
a. Name - Used to provide a personalized customer experience
b. Email - Used to send email to customers (as stated above)
c. Date of Birth - Used as a basis for guests to receive offers from businesses (as stated above)
Note: The main user of this application is not the customers who go to the nail salon, hair salon...but the business owners.