Get a single Key & Prefetch Keys

The Integrator API now includes a Get a single Key endpoint.

Service Providers can take advantage of a new App Switch URL: prefetchkeys. Using it will make the Unloc app download all the Keys associated with a user beforehand, instead at the time of opening a Lock. This improves performance by having all the Keys immediately available, and, covers the case where a Lock might be located at a place with poor or no internet coverage whatsoever.