'components' => [
	// ...
	'wechat' => [
		'class' => 'maxwen\easywechat\Wechat',
		// 'userOptions' => []  # user identity class params
		// 'sessionParam' => '' # wechat user info will be stored in session under this key
		// 'returnUrlParam' => '' # returnUrl param stored in session
	],
	// ...
]

// here are two representative examples that will help you:

// 微信网页授权:
if(Yii::$app->wechat->isWechat && !Yii::$app->wechat->isAuthorized()) {
	return Yii::$app->wechat->authorizeRequired()->send();
}

// 微信支付(JsApi):
$orderData = [ 
	'openid' => '.. '
	// ... etc. 
];
$order = new WechatOrder($orderData);
$payment = Yii::$app->wechat->payment;
$prepayRequest = $payment->prepare($order);
if($prepayRequest->return_code = 'SUCCESS' && $prepayRequest->result_code == 'SUCCESS') {
	$prepayId = $prepayRequest->prepay_id;
}else{
	throw new yii\base\ErrorException('微信支付异常, 请稍后再试');
}

$jsApiConfig = $payment->configForPayment($prepayId);

return $this->render('wxpay', [
	'jsApiConfig' => $jsApiConfig,
	'orderData'   => $orderData
]);

// in this way you need to create a wechat.php in the same directory of params.php
// put contents in the wechat.php like:
// return [ 
// 		// wechat options here 
// ];
'WECHAT' => require(__DIR__.'/wechat.php'),

'WECHAT' => [ // wechat options here ]