Google purchase API for standlone application

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http://stackoverflow.com – I am trying to set up an application to query the Google Android purchase API to check the validity of Google purchase tokens. As far as I can see the Google Android API does not support service accounts so I will need to use the OAuth flow to access the API even though no user consent is required? Is this correct? If so I will need to manually generate a refresh token for the app to use. Surely there must be another way? (HowTos)