WhatsApp OTP Example

Send WhatsApp OTP with PHP

A PHP cURL example for server-side WhatsApp OTP sending.

Setup

Enable cURL in PHP.
Store DNZ API settings outside the public web root.

Code

$payload = [
  "apiKey" => getenv("WHATSAPP_OTP_API_KEY"),
  "number" => "+9647878785391",
  "message" => "Your verification code is 482910",
];

$ch = curl_init(getenv("WHATSAPP_OTP_ENGINE_URL") . "/api/send-otp");
curl_setopt_array($ch, [
  CURLOPT_POST => true,
  CURLOPT_HTTPHEADER => ["Content-Type: application/json"],
  CURLOPT_POSTFIELDS => json_encode($payload),
  CURLOPT_RETURNTRANSFER => true,
]);

$body = curl_exec($ch);
$status = curl_getinfo($ch, CURLINFO_HTTP_CODE);
curl_close($ch);

if ($status >= 400) {
  throw new Exception("DNZ WhatsApp OTP failed: " . $body);
}

Production notes

Validate the phone number before sending.
Hash and expire OTP values in your database.

Setup

Code

Production notes

Related links