I am keen to sell a range of different products to my audience, which is a mix of current paid-up subscribers and visitors. Previously in V3, I would instruct those who held an active subscription to login with their membership details and then use the 'upgrade' text as below. "upgrade.php?price_group=-53"...This would ensure that they didnt have to re-register their details and create a new username/password. Any purchase would be logged to their existing account. Also, those not yet a paid subscriber would simply get the signup.php link below, ensuring they registered their details ahead of purchase signup.php?price_group=-53 As i recently upgraded to V4, neither of these upgrade or sign-up codes work currently. Any suggestions on how to best sell products to these 2 different audiences?