use Stone009\HmpayAgent\Agent;

$config = [
    'app_id' => 'xxxxxxxxxxxxxxxxxxxxxxxxxxx',
    'private_key' => 'xxxxxxxxxxxxxxxxxxxxxxxxxxx',
    ...
];
$agent = new Agent($config);

//代理商进件商户
$params = [
    'merchant_type' => 'GENERAL_MERCHANT',
    ...
];
$response = $agent->merchant->postData('merchant.create', $params);