I have followed each of these steps a myriad of times as indicated elsewhere in the forum I've tried it in the sandbox using both direct payment and IPN. I am still unable to connect to PayPal. We are trying to enable the Ads module (the display ads) to accept PayPal. In testing, no matter what I try, I receive the error message:
ERROR: API Username, Password, Certificate File and Environment must all be set
Any further information would be most helpful. Thank you.
