{
  "sms": {
    "message": {
      "text": "Message via API",
      "pushtype": "alert",
      "delay": "2014-06-15T15:00:00+00:00",
      "senderid": "SMSFactor"
    },
    "recipients": {
      "gsm": [
      {
        "gsmsmsid": "100",
        "value": "33601020304"
      },
      {
        "gsmsmsid": "101",
        "value": "33601020305"
      }
      ]
    }
  }
}

<?php
// voir https://secure.smsfactor.com/token.html;
$token = "";
$content = "Votre message";
$numbers = array('0601020304','0704030201');
$recipients = array();
foreach ($numbers as $n) {
  $recipients[] = array('value' => $n);
}

$postdata = array(
  'sms' => array(
   'message' => array(
    'text' => $content,
   ),
   'recipients' => array('gsm' => $recipients)
  )
);

$ch = curl_init();
curl_setopt($ch, CURLOPT_URL, "https://api.smsfactor.com/send");
curl_setopt($ch, CURLOPT_RETURNTRANSFER,1);
curl_setopt($ch, CURLOPT_POST, 1);
curl_setopt($ch, CURLOPT_POSTFIELDS, json_encode($postdata));
curl_setopt($ch, CURLOPT_HTTPHEADER, array('Content-Type: application/json', 'Accept: application/json', 'Authorization: Bearer ' . $token));
$response = curl_exec($ch);
curl_close($ch);


<?xml version="1.0" encoding="UTF-8"?>
<sms>
  <message>
  <text>Message via API</text>
    <pushtype>alert</pushtype>
    <delay>2014-06-15T15:00:00+00:00</delay>
    <sender>SMSFactor</sender>
  </message>
  <recipients>
    <gsm gsmsmsid="100">33601020304</gsm>
    <gsm gsmsmsid="101">33601020305</gsm>
  </recipients>
</sms>


<?xml version="1.0" encoding="UTF-8"?>
<sms>
  <message>
  <text>Message via API</text>
    <pushtype>alert</pushtype>
    <delay>2014-06-15T15:00:00+00:00</delay>
    <sender>SMSFactor</sender>
  </message>
  <recipients>
    <gsm gsmsmsid="100">33601020304</gsm>
    <gsm gsmsmsid="101">33601020305</gsm>
  </recipients>
</sms>


<?xml version="1.0" encoding="UTF-8"?>
<sms>
  <message>
  <text>Message via API</text>
    <pushtype>alert</pushtype>
    <delay>2014-06-15T15:00:00+00:00</delay>
    <sender>SMSFactor</sender>
  </message>
  <recipients>
    <gsm gsmsmsid="100">33601020304</gsm>
    <gsm gsmsmsid="101">33601020305</gsm>
  </recipients>
</sms>


<?xml version="1.0" encoding="UTF-8"?>
<sms>
  <message>
  <text>Message via API</text>
    <pushtype>alert</pushtype>
    <delay>2014-06-15T15:00:00+00:00</delay>
    <sender>SMSFactor</sender>
  </message>
  <recipients>
    <gsm gsmsmsid="100">33601020304</gsm>
    <gsm gsmsmsid="101">33601020305</gsm>
  </recipients>
</sms>