I’m supposing my issue is not related only to Jovo, but definitely it has direct relation on it.
I tried several times to connect digital purchases for Assistant. By making all the steps in tutorial I have an apk in Google Publisher Console with appropriate directive in AndroidManifest, all necessary settings and service account which access token I use for getConsumabled().
And if access token I get whenever my getConsumables() method finished with error. Precisely speaking Promise resolves with
message: ‘The caller does not have permission’,
but I nearly pretty sure I had completed all things to make it work.