How can I implement Senior Citizen (SC) Discount to apply automatically after enabling BIR?

How can I implement Senior Citizen (SC) Discount to apply automatically after enabling BIR?

For BIR accreditation, the application should offer every Senior Citizen (SC) or Person With Disability (PWD) a specific discount on the entire transaction. When you enable BIR, a new promotion type - Senior Citizens Discount Promotion is automatically created and appears under Promotions. This special promotion is created to ensure that a specific discount of 20% is applied to all senior citizen customers on the total bill / invoice value, when such a customer is selected on the POS terminal.