need to implement a validation rule for a form in jontentsubscription. upon form success assign to usergroup. the form needs to allow a user to input an id number(id number also has a membership level) e.g. 123456,0 would be member id 123456 and a level of 0,1,2 if 0 is returned from the database then the user is allowed to register in joomla as that respected member type without having to pay using jcontentsubscription. basically i need a registration page that checks a number against a list of numbers and if it is valid the user does not have to pay for that subscription level.