I m currently testing the Dokan PayPal Adaptive Payments system using the Paypal sandbox account. I have filled in the Sandbox App Username, Sandbox App Password and Sandbox App Signature in the settings.
1. When i checkout as a customer, it jumps to a paypal page with this message ‘This transaction is invalid. Please return to the recipient's website and try again.'
2. I have enabled the debug log, however i cant locate this file ‘Log PayPal events, such as IPN requests, inside woocommerce/logs/paypal-05335035103b7debccf27e272caff377.txt'