The service account needs to be authorized or it cant access the emails for the domain. “Client is unauthorized to retrieve access tokens using this method” Means that you have not authorized it properly check Delegating domain-wide authority to the service account
UPDATE: You might want to check my second answer below this one for a more complete code. Finally, I worked today, so here’s the complete code answer for finding the body – thanks to @Tholle: // Authentication things above /* * Decode the body. * @param : encoded body – or null * @return : … Read more
This can be done with the Oauth2 Playground at https://developers.google.com/oauthplayground Steps:- Create the Google Account (eg. [email protected]) – Or skip this step if you are using an existing account. Use the API console to register the mydriveapp (https://console.developers.google.com/apis/credentials/oauthclient?project=mydriveapp or just https://console.developers.google.com/apis/) Create a new set of credentials. Credentials/Create Credentials/OAuth Client Id then select Web application … Read more