Send custom logs on Stackdriver with Apigee Hybrid

[pakilodi]

Hello everyone,

i need to send custom logs on Stackdriver with Apigee Hybrid. Unfortunately, i can't enable extensions.

I saw that i can call the Stackdriver API to log an entry on my project, but, obviously, i need the Authorization Bearer Token to call the API.

How i can retrieve the same in proxy in Apigee?