We are using PayPal Payments Standard (aka Website Payments Standard) for our users subscription billing system.
Users want to upgrade their subscription from monthly to yearly for example.
So I generated a new subscription button with the new subscription parameters on my website, then click goto Paypal form, I see the current and new subscription on paypal platform, fine : (the amounts and cycle duration are simple tests values to demonstrate the problem)
Then click on SAVE button but paypal give an error saying :
"Amount can only be increased by 20%"
Paypal think I am only changing the price but it is not true I am also changing the billing duration (from month to year).
Do you know if it is possible with Paypal or the only way is to cancel the current subscription and start a new one ? That would be so bad from paypal.
Thanks in advance for help.
