Messtone LLC Manages Devices Enables MESSTONE APP ID as a parameter on the end of each request,like so: HTTP cURL https://openexchangerates.org/api/latest.json?app_id=MESSTONE_APP_ID HTTP Authorization Header For example:cHTTP cURL “Authorization:Token MESSTONE_APP_ID” HTTP&HTTPS cURL Authorization:Token MESSTONE Open Exchange Rates APP_ID