JSON sent: {"app_id":"32377c7c-cceb-4b6f-bba9-051aa27f3017","included_segments":["Elite"],"data":{"foo":"bar"},"contents":{"en":"alert message"},"headings":{"en":"Title"}} JSON received: {"allresponses":"{\"errors\":[\"Please include a case-sensitive header of Authorization: Basic \\u003cYOUR-REST-API-KEY-HERE\\u003e with a valid REST API key.\"],\"reference\":[\"https:\/\/documentation.onesignal.com\/docs\/accounts-and-keys#section-keys-ids\"]}"}