Which type of module shoul I create? Please help me!

[mahdilashkari]

Hi
I want to create a module in which after a successful payment, some access permission should be grant to the user. For example, after a successful payment, user could access to videos in my site(only inserting some boolean value in a database table). Which type of module should I design? payment or shipping or totalOrder? Could you guide me?
Thanks a lot!