Send a file to a new or existing chat.

$ch = curl_init();
curl_setopt($ch, CURLOPT_URL,"https://insprl.com/api/whatsapp/msg/send-file");
curl_setopt($ch, CURLOPT_POST, 1);
curl_setopt($ch, CURLOPT_HTTPHEADER, array( 'Authorization: {CLIENT_KEY}'
));
curl_setopt($ch, CURLOPT_POSTFIELDS, 
http_build_query(
array(
   'client_id'	=> '{CLIENT_ID}',
   'instance_id' => '{SPRL_INSTANCE_ID}',
   'countrycode' => '91',
   'mobile' => '9000000000',
   'file_url' => 'https://insprl.com/assets/images/NEW/share-img.jpg',
   'filename' => 'demoimage.jpg',
   'caption' => 'You are viewing Demo Image'
)
));
curl_setopt($ch, CURLOPT_RETURNTRANSFER, true);
$response = curl_exec($ch);
curl_close ($ch);

{
"code": 100,
"message": "success",
"data": {
   "campaign_id": "2302383923",
   "msgid": "SKFIEK239D",
   "status": "sent",
   "msg": "ok"
}
}