The to phone number needs to be with international dial code. The from can't be more than 11 chars.
https://flashyapp.com/api/sms/send
{"key": "__API_KEY__","message": {"to": "972526845430","from": "Flashyapp","message": "Hello world from Flashyapp."}}
<?php$send = $flashy->sms->send(array("to" => "972526845430","from" => "Flashyapp","message" => "Hello world from Flashyapp."));?>
200: OK
{"success": true,"status": "sent"}
200: OK - SMS Failed
{"success": true,"status": "failed"}