Implement payments service endpoints.

This is not yet fully ready, as the payment request endpoint should not require user login, but should instead use a secure identifier for easy handling by wallet software. However, this is now suitable for initial testing.

Created by  Kris Nuttycombe  on February 22, 2017
AL37SVTCKRSG4HG2PCYK5Z7QSIZZH5JHH4Q2VLMXFAXSAQRFFG4QC
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