Paypal_Lib + Monthly Subscription

[eluser]bondjp[/eluser]
Thanks for posting.
I'm a newbie so i'm finding a bit hard to merge this.
Ok i can take this code and insert it in Paypal_Lib.
How can i then make my controller to work?
Here's where i will handle the monthly subscriptios:

Controller

Code:

........

function vip(){
    if ($this->tank_auth->is_logged_in())  
        {
        $userid=$this->uri->segment(3);
        
        $this->paypal_lib->add_field('business', '[email protected]');
        $this->paypal_lib->add_field('return', site_url('membership/success/'.$userid));
        $this->paypal_lib->add_field('cancel_return', site_url('membership/cancel/'.$userid));
        $this->paypal_lib->add_field('notify_url', site_url('membership/ipnvip/'.$userid)); // <-- IPN url
        $this->paypal_lib->add_field('custom', $userid); // User ID
        

        $this->paypal_lib->add_field('item_name', 'VIP MEMBERSHIP');
        $this->paypal_lib->add_field('item_number', '3');
        
        
        $this->paypal_lib->paypal_auto_form();
        } else {
                redirect('home');
                }
  }