Check If A Number Is On WhatsApp
Note :
in case the token not authorized , the message will add to queue and will be sent when the WhatsApp token is ready.
Request URL
https://api.wachat.net/isonwa
Request body
token *Required
receiver *Required

Phone number with international format e.g. 6287766969318

{"success":true,"receiver":"6287766969318","isonwa":true}

Rest API

 $url = 'https://api.wachat.net/isonwa';

 $data = [
   'receiver' => '$receiver',
   'token' => '$token',

 ];

 $ch = curl_init();
curl_setopt($ch, CURLOPT_HTTPHEADER,  ['Content-Type: application/x-www-form-urlencoded']);
curl_setopt($ch, CURLOPT_CUSTOMREQUEST, 'POST');
curl_setopt($ch, CURLOPT_RETURNTRANSFER, true);
curl_setopt($ch, CURLOPT_POSTFIELDS, http_build_query($data));
curl_setopt($ch, CURLOPT_URL, $url);
curl_setopt($ch, CURLOPT_TIMEOUT, 30);
curl_setopt($ch, CURLOPT_SSL_VERIFYHOST, 0);
curl_setopt($ch, CURLOPT_SSL_VERIFYPEER, 0);
 $response = curl_exec($ch);
curl_close($ch);

echo $response; // output {success:true/false, isonwa:true/false}

Note : don't forget to URL encode your query params like base64 or utf-8