Add more examples of creating role/node/group subscriptions. More details on using PayPal Sandbox including: Go to administer/settings/lm_paypal and tell it that the PayPal host is www.sandbox.paypal.com and also set "LM PayPal Obey Test IPNS"

Maybe some basic help on using PayPal Sandbox, see following. Make it CLEAR that I have not the time to do detailed PayPal or Sandbox help!

PayPal Sandbox can appear complex to use at first. You have to register using real world details to login to developer.paypal.com. Once inside you can create Sandbox accounts that exist entirely inside your developer account. Sandbox accounts can do all the usual PayPal things, send/recv money, subscribe, ... All PayPal generated emails for Sandbox accounts go to the developer.paypal.com email system. So you could, for example, create a Sandbox account with the same details as your real world PayPal account. One issue to be wary of is that you should maintain an active window to developer.paypal.com while testing or accesses by Drupal to your sandbox accounts will fail.

I'd like to be able to give more help on PayPal/Sandbox but it would take more time than I have available and there is plenty of help out there.