Thank you @brekrut for your response.But that documentation is not helping. These are different types of authentication that I already tried but nothing is working. Related Adobe documentation does not mention, from where in GCP we can collect those information.

Hello All,I am trying to connect Google PubSub as a source connector in AEP.There are two requirements for this connection: 1. Project Id, 2. Credentials. Please help me from how and from where in GCP console, I can get the credential? In GCP console, I tried to create an API key but it did not work...