Certificate of Achievement

A certificate gives strong moral support to the recipient for the work hard executed to date. It improves morale and makes them likely to push harder next time to improve their performance further.

It will encourage them to remain loyal customers in order to receive further praise (more certificates).

A certificate is a great way to let people know that their hard work is appreciated.

It's a simple concept: when you give someone a certificate for doing something awesome, they feel motivated to do more awesome things.