The following information will be necessary for the account to authenticate with the processor:

Partner
Merchant Login
User
Password

The User will need to have the ability to make transactions in Paypal. Questions on appropriately configuring this User should be directed to Paypal support. If there are issues authenticating the account, Blackbaud may request that the User be given full Administrative rights to allow us to better test these credentials during their application.

Please refer to the steps found here, outlining the process to get these credentials in place.