PHP Example: Creating a Static Wallet

<?php

declare(strict_types=1);

$merchantId = getenv('COINSSEND_MERCHANT_ID');
$apiKey = getenv('COINSSEND_API_KEY');

$payload = [
    'network' => 'tron',
    'coin' => 'usdt',
    'type' => 'static',
    'label' => 'Checkout deposits',
    'webhook_url' => 'https://merchant.example/coinssend/webhook',
];

$body = json_encode($payload, JSON_THROW_ON_ERROR);
$sign = md5(base64_encode($body).$apiKey);

$handle = curl_init('https://api.coinssend.com/v1/wallet-address');
curl_setopt_array($handle, [
    CURLOPT_RETURNTRANSFER => true,
    CURLOPT_POST => true,
    CURLOPT_POSTFIELDS => $body,
    CURLOPT_HTTPHEADER => [
        'Content-Type: application/json',
        'Merchant: '.$merchantId,
        'Sign: '.$sign,
    ],
]);

$rawResponse = curl_exec($handle);
if ($rawResponse === false) {
    throw new RuntimeException(curl_error($handle));
}

$httpStatus = curl_getinfo($handle, CURLINFO_HTTP_CODE);
curl_close($handle);
$response = json_decode($rawResponse, true, flags: JSON_THROW_ON_ERROR);

if ($httpStatus < 200 || $httpStatus >= 300) {
    throw new RuntimeException($response['error'] ?? $response['message'] ?? "HTTP {$httpStatus}");
}

printf("Address: %s\nQR: %s\n", $response['data']['address'], $response['data']['qr_code_url']);

Static-wallet creation has no request idempotency contract. A timeout does not prove that creation failed, so do not automatically repeat this POST. Fetch the live catalog instead of treating the example asset pair as permanent.