anchor.diff:  * Errors use a non-200 and (optionally) an error payload. See subsection on Error Responses for more detail.
   
   + Parameters
  -    + subId: abcdef (required, string) - subscription Id.
  +    + subscriptionId: abcdef (required, string) - subscription Id.
   
   + Response 200 (application/json)
   
  
positive.code: 
  + Response 204
  
  ### Delete context provider registration [DELETE /v2/registrations/{regId}]
  
  Cancels registration.
  
  
negative.code: 
  A `subject` contains the following subfields:
  
  * `id` or `idPattern` : Id or pattern of the affected entities (optional). Both cannot be used at the same time.
  * `entity` : Id or pattern id which identifies the affected entities (optional).
  * `type` : Type of the affected entities (optional).
  * `attributes`: List of attributes to be provided (if not specified it would mean all).
  