Send SMS Message to Contact Group

$ch = curl_init();
curl_setopt($ch, CURLOPT_URL,"https://insprl.com/api/sms/send-to-group");
curl_setopt($ch, CURLOPT_POST, 1);
curl_setopt($ch, CURLOPT_HTTPHEADER, array( 'Authorization: {CLIENT_KEY}'
));
curl_setopt($ch, CURLOPT_POSTFIELDS, 
http_build_query(
array(
   'client_id'	=> '{CLIENT_ID}',
   'sender_id'	=> '{6_CHAR_SENDER_ID}',
   'msgtype'	=> 'txn',
   'groupkey'	=> '{CONTACT_GROUP_KEY}',
   'temp_id'	=> '170056985632546',
   'message'	=> 'Hi Customer, This is an alert Message',
   'schedule_date' => '03-02-2020',
   'schedule_time' => '13:20',
   'unicode' => 0,
   'flash' => 0,
   'campaign_name' => 'My campaign 2020 Jan'
)
));
curl_setopt($ch, CURLOPT_RETURNTRANSFER, true);
$response = curl_exec($ch);
curl_close ($ch);

{
"code":"100",
"message":"success",
"data":{
   "batchid":"2392392933",
   "msg":"Your message has been sent to 1000 no(s).",
   "credit":"1000"
}
}