Hello David, Those credentials are payflow credentials, used to authenticate against our payflow API endpoints. From within a sandbox account which has been upgraded to payments pro, go to the "API Access" section within the account profile. Direct URL : https://paypalmanager.sandbox.paypal.com/apiAccess.do?subaction=api On that page, select "Setup Payflow Pro API Access" to create the required credentials. Thanks !
... View more