Getting google dev_acc id programmatically

Question

Given that a user (Google Play's account owner) already authenticated my application (Google App Engine's service account) with the correct scopes...

Is there an endpoint in google API that returns the dev_acc parameter used to access their play store developer account?

to be specific I want to retrieve it to access the following URI https://play.google.com/apps/publish/?dev_acc=DEV_ACC_ID or cloud storage buckets found in gs://pubsite_prod_rev_DEV_ACC_ID/ programmatically?

or alternatively, list all the cloud storage buckets they have? (including the gs://pubsite_prod_rev_DEV_ACC_ID/ bucket)