This is GREAT! Thanks! I was struggling with the same thing and will try this. Quick question, though... Why not just use the Google API for Java in a proc Groovy? https://developers.google.com/identity/protocols/OAuth2ServiceAccount?hl=en_US#delegatingauthority (see the "Preparing to make an authorized API call" heading and Java example). The Java API are at https://github.com/google/google-api-java-client#Service_Accounts From the sounds of it, the SHA256HMACHEX('key','message',3) function doesn't quite work like this groovy option, is that correct?
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