To integrate PayPal with Stays, it's necessary that you enter the PayPal API key on the channel settings. The key consists of three pieces of information: user, password and signature. After copying the information on your PayPal account, paste it on the fields of your system. See the example below.
User and password are API information generated through the PayPal portal and don't work as access credentials to the tool.
Access your business PayPal account and follow the instructions of the platform.