anchor.diff:  ----
   
   ===== Members
  -*authenticateRequests* of type _array_ of _AuthenticateRequest_::
  +*authenticateRequests* of type `array` of `AuthenticateRequest`::
     A list of AuthenticateRequest dictionaries, one for each previously
     registered U2F device for the user.
   
  
positive.code: ----
  
  ==== DeviceMetadata
  The metadata provided in the DeviceDescriptor contains metadata about the
  device vendor as well as the device itself. The two contained fields
  (_VendorInfo_ and _Device_) are described link:missing.html[here].
  
  [source,javascript]
  ----
  
negative.code: Initializes registration for the given user (all registered devices).
  
  ===== Server response
  `RegisterRequestData`
    
  ==== +HTTP POST+
  
  