+1 for this, further question for this, i'll post later.
Possible, it would be 'ERROR' if you will input 'NULL' numbers or any item that's not inserted in DATABASE.
Preview:
http://i45.tinypic.com/icv31c.png
e.g i'll put 21313asdqw3 , when i input that it still continue the processing, possible it will say 'ERROR: Please Input Correctly, or check databse for items and etc.
To PREVENT spamm in 'database'
Possible to choose generate key "STANDARD" or MD5M" just like IP.Board
And also, it could be nice if you could add feature that admin can check if the COUPON is available or not.
and time when he/she claim the coupon and check I.P's for more secure method.
Thank you!