Changes to Retrieve a batch of contacts

the endpoint scheme security oauth2 was removed from the API

added the optional property results/items/warnings to the response with the 200 status

added the optional property results/items/warnings to the response with the 207 status

the endpoint scheme security app_cookie was removed from the API

the endpoint scheme security hapikey was removed from the API

the endpoint scheme security internal_cookie was removed from the API

the endpoint scheme security private_apps was removed from the API

the endpoint scheme security shhkey was removed from the API