The Crowd-Fundraiser plugin uses the Seamless Donations plugin for the actual collection of donations and so Seamless Donations needs to be properly installed and working. For general instructions for using and setting up Seamless Donations, refer to its support site.
For PAAJAF, there are 3 important configuration/settings fields:
– PayPal Interface Mode. For testing, select the Sandbox (Test Server) and donations are not actually processed (i.e., no money changes hands). But when live, select the Live option or else donations will not actually be made.
– PayPal Email Address. This email address corresponds to the PayPal account and there is a test account on the Sandbox and a different account on the live server. For the Sandbox, you can use [email protected] as the test account I have established or you can establish your own sandbox account.
– Notification Email Address(es). This is a list of emails that will receive notification when a donation is made. This is particularly important for handling offline pledges; [email protected] is the usual setting.