I recently signed up to the GreenLight Hyper Market http://www/glpayment.co.uk

they offer a sms/phone service that allows members of my website to buy credits using their mobile phone and in return get a keycode. which they then enter into my site to get the credits they ordered.

i have set it all up with my website but i was wondering if anyone knew how to make it so that when they entered the keycode it added the credits to their account.