I have integrated the Paypal subscription option into my site. My problem is when I try to upgrade the subscription it shows an error in Paypal:
Amount can only be increased by 20%
Subscription amount is $0.25
Upgrade amount is $0.59
How can i increase the percentage of the amount?
I just ran into this myself. It's a pretty ridiculous limitation. Rumor has it that even PayPal Pro has this limitation, although I haven't personally verified. Looks like there is no way around it other than to instruct users to cancel their membership and re-subscribe with a new membership.