Sending a PDF document to a WhatsApp user in PHP

send-pdf-individual.php

<?php
  $INSTANCE_ID = 'YOUR_INSTANCE_ID_HERE';  // TODO: Replace it with your gateway instance ID here
  $CLIENT_ID = "YOUR_CLIENT_ID_HERE";  // TODO: Replace it with your Premium client ID here
  $CLIENT_SECRET = "YOUR_CLIENT_SECRET_HERE";   // TODO: Replace it with your Premium client secret here

  $pathToDocument = "/tmp/your_doc.pdf";    // TODO: Replace it with the path to your document
  $docData = file_get_contents($pathToDocument);
  $base64Doc = base64_encode($docData);
  $fn = "anyname.pdf";                      // TODO: Replace it with a name you like
  $caption = "You will find the map handy.";    // caption is optional; can be empty

  $postData = array(
    'number' => '12025550108',  // TODO: Specify the recipient's number (NOT the gateway number) here.
    'document' => $base64Doc,
    'filename' => $fn,
    'caption' => $caption
  );

  $headers = array(
    'Content-Type: application/json',
    'X-WM-CLIENT-ID: '.$CLIENT_ID,
    'X-WM-CLIENT-SECRET: '.$CLIENT_SECRET
  );

  $url = 'http://api.whatsmate.net/v3/whatsapp/single/document/message/' . $INSTANCE_ID;
  $ch = curl_init($url);
  curl_setopt($ch, CURLOPT_POST, 1);
  curl_setopt($ch, CURLOPT_RETURNTRANSFER, true);
  curl_setopt($ch, CURLOPT_HTTPHEADER, $headers);
  curl_setopt($ch, CURLOPT_POSTFIELDS, json_encode($postData));
  $response = curl_exec($ch);
  echo "Response: ".$response;
  curl_close($ch);
?>