Happy Birthday {First Name}!
Everyone here at {Business} is ready to help you celebrate.
So enclosed with this letter, you’ll find a $25.00 Gift Certificate to be used any time during the month of {Month} at {Business}.
However, to claim your Birthday Gift, you must use it before {date}:
We look forward to celebrating with you!
Sincerely,
{Your Name}
P.S. We’ll also have a “birthday goodie bag” waiting for you. A little extra surprise and thank you for you…