Thank you so much for your script, very useful! I've carefully followed your installation instruction and uploaded your "web" folder, keeping his original name, to the root of my domain but after click on PayNow (step 6) the simulator displays: email error: 535 Incorrect authentication data [CProductMailer] My business paypal e-mail [SIM_SELLER_EMAIL] is correct, what can I check more?
It means the mail server couldn't authenticate you. Please make sure the username and password you entered for the mail server in the configuration file is correct. ( The paypal email address is irrelevant in this matter. )