The sca REST api should enable an oauth'd request to:
1) Check the pay prefs for the user, and 2) purchase a new p3a subscription via the API
as per the spec at: https://docs.google.com/a/canonical.com/document/d/1i8g-55GwQbDwseRDsISo4C1GEPOBsHuihiUt7oBy498/edit
The sca REST api should enable an oauth'd request to:
1) Check the pay prefs for the user, and
2) purchase a new p3a subscription via the API
as per the spec at: /docs.google. com/a/canonical .com/document/ d/1i8g- 55GwQbDwseRDsIS o4C1GEPOBsHuihi Ut7oBy498/ edit
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