What is their name | First name or last name? | What is their customer id
SELECT t1.customer_id FROM customers AS T1 JOIN discount_coupons AS T2 ON T1.coupon_id   =   T2.coupon_id WHERE T2.coupon_amount   =   500
their name is not directly queried, the requirement seems to ask for customer identification details; first name or last name is not selected, indicating a potential misunderstanding in the requirement as it does not match the SQL provided; customer id refers to T1.customer_id;