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hi guys

i have a website with a service on it which works without a login system. i want to charge for it through payment gateway, how do i ensure that each session for the user is unique when multiple users access the same service?

example if user A inputs 2+2=?, then website redirects him to payment gateway after which result 4 is shown.
but while user A completes his session another user B comes in and wants to know 3+5= ?, say if i have a 100 users simultaneously starting sessions wanting to know their results how do i go about handling them?
You could add a session variable using a unique code.

Here is a helper function to generate a unique code

PHP Code:
// -----------------------------------------------------------------------

/**
 * guidV4 ()
 * -----------------------------------------------------------------------
 *
 * A universally unique identifier (UUID) it is a 128-bit number
 * used to identify information in computer systems.
 *
 * xxxxxxxx-xxxx-Mxxx-Nxxx-xxxxxxxxxxxx
 *
 */
if ( ! function_exists('guidV4'))
{
    
/**
     * guidV4 ()
     * -------------------------------------------------------------------
     *
     * @return string
     */
    
function guidV4()
    {
        
// Microsoft guid {xxxxxxxx-xxxx-Mxxx-Nxxx-xxxxxxxxxxxx}
        
if (function_exists('com_create_guid') === true)
        {
            return 
trim(com_create_guid(), '{}');
        }

        
$data openssl_random_pseudo_bytes(16);

        
// set version to 0100
        
$data[6] = chr(ord($data[6]) & 0x0f 0x40);

        
// set bits 6-7 to 10
        
$data[8] = chr(ord($data[8]) & 0x3f 0x80);

        return 
vsprintf('%s%s-%s-%s-%s-%s%s%s'str_split(bin2hex($data), 4));
    }