Omnipay: WechatPay

composer require lokielse/omnipay-wechatpay

//gateways: WechatPay_App, WechatPay_Native, WechatPay_Js, WechatPay_Pos, WechatPay_Mweb
$gateway    = Omnipay::create('WechatPay_App');
$gateway->setAppId($config['app_id']);
$gateway->setMchId($config['mch_id']);
$gateway->setApiKey($config['api_key']);

$order = [
    'body'              => 'The test order',
    'out_trade_no'      => date('YmdHis').mt_rand(1000, 9999),
    'total_fee'         => 1, //=0.01
    'spbill_create_ip'  => 'ip_address',
    'fee_type'          => 'CNY'
];

/**
 * @var Omnipay\WechatPay\Message\CreateOrderRequest $request
 * @var Omnipay\WechatPay\Message\CreateOrderResponse $response
 */
$request  = $gateway->purchase($order);
$response = $request->send();

//available methods
$response->isSuccessful();
$response->getData(); //For debug
$response->getAppOrderData(); //For WechatPay_App
$response->getJsOrderData(); //For WechatPay_Js
$response->getCodeUrl(); //For Native Trade Type

$gateway    = Omnipay::create('WechatPay');
$gateway->setAppId($config['app_id']);
$gateway->setMchId($config['mch_id']);
$gateway->setApiKey($config['api_key']);

$response = $gateway->completePurchase([
    'request_params' => file_get_contents('php://input')
])->send();

if ($response->isPaid()) {
    //pay success
    var_dump($response->getRequestData());
}else{
    //pay fail
}

$response = $gateway->query([
    'transaction_id' => '1217752501201407033233368018', //The wechat trade no
])->send();

var_dump($response->isSuccessful());
var_dump($response->getData());

$response = $gateway->close([
    'out_trade_no' => '201602011315231245', //The merchant trade no
])->send();

var_dump($response->isSuccessful());
var_dump($response->getData());

$gateway->setCertPath($certPath);
$gateway->setKeyPath($keyPath);

$response = $gateway->refund([
    'transaction_id' => '1217752501201407033233368018', //The wechat trade no
    'out_refund_no' => $outRefundNo,
    'total_fee' => 1, //=0.01
    'refund_fee' => 1, //=0.01
])->send();

var_dump($response->isSuccessful());
var_dump($response->getData());

$response = $gateway->queryRefund([
    'refund_id' => '1217752501201407033233368018', //Your site trade no, not union tn.
])->send();

var_dump($response->isSuccessful());
var_dump($response->getData());

$response = $gateway->shortenUrl([
    'long_url' => $longUrl
])->send();

var_dump($response->isSuccessful());
var_dump($response->getData());
var_dump($response->getShortUrl());

$response = $gateway->queryOpenId([
    'auth_code' => $authCode
])->send();

var_dump($response->isSuccessful());
var_dump($response->getData());
var_dump($response->getOpenId());