I'm trying to use https://developer.genesys.cloud/api/rest/client-libraries/web-messaging-java/ sdk in a custom java app. I developed the application following the instructions, however, when I run the application I receive the error: 403 Forbidden. Looking at the documentation it seems, I need an access_token, but it is not clear if this is a value I should generate or if there is an authentication process to follow to get the token.
Any idea?