anchor.diff:  Response:
   
   * Successful operation uses 200 OK
  -* Errors use a non-200 and (optionally) an error payload. See subsection on Error Responses for more details.
  +* Errors use a non-200 and (optionally) an error payload. See subsection on "Error Responses" for more details.
   
   + Parameters
       + registrationId: abcdef (required, string) - registration Id.
  
positive.code: ### Update or append entity attributes [POST /v2/entities/{entityId}/attrs{?type,options}]
  
  The request payload is an object representing the attributes to append or update. The object follows
  the JSON entity representation format (described in a section above), except that `id` and `type`
  are not allowed.
  
  The entity attributes are updated with the ones in the payload. In particular, depending on
  
negative.code: Response:
  
  * Successful operation uses 200 OK
  * Errors use a non-200 and (optionally) an error payload. See subsection on "Error Responses" for more details.
  
  + Parameters
      + subscriptionId: abcdef (required, string) - subscription Id.
  