curl -X POST https://otpwallah.in/api/v1/send/sms \
  -H "Authorization: Bearer ak_YOUR_API_KEY" \
  -H "Content-Type: application/json" \
  -d '{
    "mobile": "9876543210",
    "length": 6
  }'

<?php
$curl = curl_init();
curl_setopt_array($curl, [
    CURLOPT_URL => "https://otpwallah.in/api/v1/send/sms",
    CURLOPT_RETURNTRANSFER => true,
    CURLOPT_CUSTOMREQUEST => "POST",
    CURLOPT_POSTFIELDS => json_encode([
        "mobile" => "9876543210",
        "length" => 6
    ]),
    CURLOPT_HTTPHEADER => [
        "Authorization: Bearer ak_YOUR_API_KEY",
        "Content-Type: application/json"
    ],
]);
$response = curl_exec($curl);
$err = curl_error($curl);
curl_close($curl);
?>

use Illuminate\Support\Facades\Http;

$response = Http::withToken('ak_YOUR_API_KEY')
    ->post('https://otpwallah.in/api/v1/send/sms', [
        'mobile' => '9876543210',
        'length' => 6,
    ]);

if ($response->successful()) {
    $result = $response->json();
}

const axios = require('axios');

axios.post('https://otpwallah.in/api/v1/send/sms', {
    mobile: '9876543210',
    length: 6
}, {
    headers: {
        'Authorization': 'Bearer ak_YOUR_API_KEY',
        'Content-Type': 'application/json'
    }
})
.then(response => console.log(response.data))
.catch(error => console.error(error));