[bwah]

From my experience, there is no way to adjust a subscription up or down once it is initiated through Paypal.

[whyleyc]

Actually you can. See: https://www.paypalobjects.com/WEBSCR-500-20080214-1/en_US/pd...

<snip>"You can let your subscribers change the name, number, regular terms, or currency of an existing subscription without canceling it and re-subscribing by creating a Modify Subscription button."</snip>