PHP SDK

Official signed merchant client lives at packages/sdk-php/src/MerchantApiClient.php. Point base_uri at your deployment API root (same host as this docs site uses for examples).

require 'MerchantApiClient.php';

$client = new MerchantApiClient(
  '/api/v1',
  'MERCHANT_UUID',
  'PAYMENT_API_KEY' // use a TEST key in sandbox
);

$result = $client->createPayment([
  'amount' => '10',
  'currency' => 'USDT',
  'order_id' => 'order-1',
  'network' => 'TRC20',
  'url_success' => 'https://merchant.example/thanks',
  'url_callback' => 'https://merchant.example/webhooks/ULX Pay',
]);

// $result['state'] === 0 on success — redirect payer to $result['result']['url']

Always verify webhook signatures on your backend before marking an order paid.