JSON sent:
{"app_id":"3e9917e6-92d7-4ecc-8421-ffb607e796c4","include_player_ids":["e0c4854b-866b-4120-b5b0-16655e4d55ea"],"data":{"foo":"bar"},"contents":{"en":"santoshHi You have recieved a new message"},"headings":{"en":"Bendii"},"android_group":"new"}

JSON received:
{"allresponses":"{\"errors\": [\"Access denied.  Please include an 'Authorization: ...' header with a valid API key (https:\/\/documentation.onesignal.com\/docs\/en\/keys-and-ids#api-keys).\"]}\n"}