AlipayClient alipayClient = new DefaultAlipayClient("https://openapi.alipay.com/gateway.do","app_id","your private_key","json","GBK","alipay_public_key","RSA2");
AlipayTradePayRequest request = new AlipayTradePayRequest();
request.setBizContent("{" +
"\"out_trade_no\":\"20150320010101001\"," +
"\"scene\":\"bar_code\"," +
"\"auth_code\":\"28763443825664394\"," +
"\"product_code\":\"FACE_TO_FACE_PAYMENT\"," +
"\"subject\":\"Iphone6 16G\"," +
"\"buyer_id\":\"2088202954065786\"," +
"\"seller_id\":\"2088102146225135\"," +
"\"total_amount\":88.88," +
"\"discountable_amount\":8.88," +
"\"body\":\"Iphone6 16G\"," +
"      \"goods_detail\":[{" +
"        \"goods_id\":\"apple-01\"," +
"\"goods_name\":\"ipad\"," +
"\"quantity\":1," +
"\"price\":2000," +
"\"goods_category\":\"34543238\"," +
"\"body\":\"特价手机\"," +
"\"show_url\":\"http://www.alipay.com/xxx.jpg\"" +
"        }]," +
"\"operator_id\":\"yx_001\"," +
"\"store_id\":\"NJ_001\"," +
"\"terminal_id\":\"NJ_T_001\"," +
"\"extend_params\":{" +
"\"sys_service_provider_id\":\"2088511833207846\"," +
"\"industry_reflux_info\":\"{\\\\\\\"scene_code\\\\\\\":\\\\\\\"metro_tradeorder\\\\\\\",\\\\\\\"channel\\\\\\\":\\\\\\\"xxxx\\\\\\\",\\\\\\\"scene_data\\\\\\\":{\\\\\\\"asset_name\\\\\\\":\\\\\\\"ALIPAY\\\\\\\"}}\"," +
"\"card_type\":\"S0JP0000\"" +
"    }," +
"\"timeout_express\":\"90m\"," +
"\"auth_confirm_mode\":\"COMPLETE：转交易支付完成结束预授权;NOT_COMPLETE：转交易支付完成不结束预授权\"" +
"  }");
AlipayTradePayResponse response = alipayClient.execute(request);
if(response.isSuccess()){
System.out.println("调用成功");
} else {
System.out.println("调用失败");
}

IAopClient client = new DefaultAopClient("https://openapi.alipay.com/gateway.do", "app_id", "merchant_private_key", "json", "1.0", "RSA2", "alipay_public_key", "GBK", false);
AlipayTradePayRequest  request= new AlipayTradePayRequest() ;
request.BizContent="{" +
"\"out_trade_no\":\"20150320010101001\"," +
"\"scene\":\"bar_code\"," +
"\"auth_code\":\"28763443825664394\"," +
"\"product_code\":\"FACE_TO_FACE_PAYMENT\"," +
"\"subject\":\"Iphone6 16G\"," +
"\"buyer_id\":\"2088202954065786\"," +
"\"seller_id\":\"2088102146225135\"," +
"\"total_amount\":88.88," +
"\"discountable_amount\":8.88," +
"\"body\":\"Iphone6 16G\"," +
"      \"goods_detail\":[{" +
"        \"goods_id\":\"apple-01\"," +
"\"goods_name\":\"ipad\"," +
"\"quantity\":1," +
"\"price\":2000," +
"\"goods_category\":\"34543238\"," +
"\"body\":\"特价手机\"," +
"\"show_url\":\"http://www.alipay.com/xxx.jpg\"" +
"        }]," +
"\"operator_id\":\"yx_001\"," +
"\"store_id\":\"NJ_001\"," +
"\"terminal_id\":\"NJ_T_001\"," +
"\"extend_params\":{" +
"\"sys_service_provider_id\":\"2088511833207846\"," +
"\"industry_reflux_info\":\"{\\\\\\\"scene_code\\\\\\\":\\\\\\\"metro_tradeorder\\\\\\\",\\\\\\\"channel\\\\\\\":\\\\\\\"xxxx\\\\\\\",\\\\\\\"scene_data\\\\\\\":{\\\\\\\"asset_name\\\\\\\":\\\\\\\"ALIPAY\\\\\\\"}}\"," +
"\"card_type\":\"S0JP0000\"" +
"    }," +
"\"timeout_express\":\"90m\"," +
"\"auth_confirm_mode\":\"COMPLETE：转交易支付完成结束预授权;NOT_COMPLETE：转交易支付完成不结束预授权\"" +
"  }";
AlipayTradePayResponse response=client.execute(request);
Console.WriteLine(response.Body);

$aop = new AopClient ();
$aop->gatewayUrl = 'https://openapi.alipay.com/gateway.do';
$aop->appId = 'your app_id';
$aop->rsaPrivateKey = '请填写开发者私钥去头去尾去回车，一行字符串';
$aop->alipayrsaPublicKey='请填写支付宝公钥，一行字符串';
$aop->apiVersion = '1.0';
$aop->signType = 'RSA2';
$aop->postCharset='GBK';
$aop->format='json';
$request = new AlipayTradePayRequest ();
$request->setBizContent("{" .
"\"out_trade_no\":\"20150320010101001\"," .
"\"scene\":\"bar_code\"," .
"\"auth_code\":\"28763443825664394\"," .
"\"product_code\":\"FACE_TO_FACE_PAYMENT\"," .
"\"subject\":\"Iphone6 16G\"," .
"\"buyer_id\":\"2088202954065786\"," .
"\"seller_id\":\"2088102146225135\"," .
"\"total_amount\":88.88," .
"\"discountable_amount\":8.88," .
"\"body\":\"Iphone6 16G\"," .
"      \"goods_detail\":[{" .
"        \"goods_id\":\"apple-01\"," .
"\"goods_name\":\"ipad\"," .
"\"quantity\":1," .
"\"price\":2000," .
"\"goods_category\":\"34543238\"," .
"\"body\":\"特价手机\"," .
"\"show_url\":\"http://www.alipay.com/xxx.jpg\"" .
"        }]," .
"\"operator_id\":\"yx_001\"," .
"\"store_id\":\"NJ_001\"," .
"\"terminal_id\":\"NJ_T_001\"," .
"\"extend_params\":{" .
"\"sys_service_provider_id\":\"2088511833207846\"," .
"\"industry_reflux_info\":\"{\\\\\\\"scene_code\\\\\\\":\\\\\\\"metro_tradeorder\\\\\\\",\\\\\\\"channel\\\\\\\":\\\\\\\"xxxx\\\\\\\",\\\\\\\"scene_data\\\\\\\":{\\\\\\\"asset_name\\\\\\\":\\\\\\\"ALIPAY\\\\\\\"}}\"," .
"\"card_type\":\"S0JP0000\"" .
"    }," .
"\"timeout_express\":\"90m\"," .
"\"auth_confirm_mode\":\"COMPLETE：转交易支付完成结束预授权;NOT_COMPLETE：转交易支付完成不结束预授权\"" .
"  }");
$result = $aop->execute ( $request); 

$responseNode = str_replace(".", "_", $request->getApiMethodName()) . "_response";
$resultCode = $result->$responseNode->code;
if(!empty($resultCode)&&$resultCode == 10000){
echo "成功";
} else {
echo "失败";
}

https://openapi.alipay.com/gateway.do?timestamp=2013-01-01 08:08:08&method=alipay.trade.pay&app_id=5281&sign_type=RSA2&sign=ERITJKEIJKJHKKKKKKKHJEREEEEEEEEEEE&version=1.0&biz_content=
  {
"out_trade_no":"20150320010101001",
"scene":"bar_code",
"auth_code":"28763443825664394",
"product_code":"FACE_TO_FACE_PAYMENT",
"subject":"Iphone6 16G",
"buyer_id":"2088202954065786",
"seller_id":"2088102146225135",
"total_amount":88.88,
"discountable_amount":8.88,
"body":"Iphone6 16G",
      "goods_detail":[{
        "goods_id":"apple-01",
"goods_name":"ipad",
"quantity":1,
"price":2000,
"goods_category":"34543238",
"body":"特价手机",
"show_url":"http://www.alipay.com/xxx.jpg"
        }],
"operator_id":"yx_001",
"store_id":"NJ_001",
"terminal_id":"NJ_T_001",
"extend_params":{
"sys_service_provider_id":"2088511833207846",
"industry_reflux_info":"{\\\"scene_code\\\":\\\"metro_tradeorder\\\",\\\"channel\\\":\\\"xxxx\\\",\\\"scene_data\\\":{\\\"asset_name\\\":\\\"ALIPAY\\\"}}",
"card_type":"S0JP0000"
    },
"timeout_express":"90m",
"auth_confirm_mode":"COMPLETE：转交易支付完成结束预授权;NOT_COMPLETE：转交易支付完成不结束预授权"
  }

//为确保安全通信，需自行验证响应示例中的sign值是否为蚂蚁金服所提供。

{
	"alipay_trade_pay_response":{
		"msg":"Success",
		"gmt_payment":"2014-11-27 15:45:57",
		"code":"10000",
		"mdiscount_amount":"88.88",
		"discount_amount":"88.88",
		"buyer_user_id":"2088101117955611",
		"invoice_amount":12.50,
		"fund_bill_list":[
			{
				"bank_code":"CEB",
				"real_amount":11.21,
				"amount":10,
				"fund_channel":"ALIPAYACCOUNT"
			}
		],
		"card_balance":98.23,
		"voucher_detail_list":[
			{
				"purchase_ant_contribute":0.82,
				"amount":10.00,
				"merchant_contribute":9.00,
				"purchase_buyer_contribute":2.01,
				"name":"XX超市5折优惠",
				"memo":"学生专用优惠",
				"purchase_merchant_contribute":1.03,
				"other_contribute":1.00,
				"template_id":"20171030000730015359000EMZP0",
				"id":"2015102600073002039000002D5O",
				"type":"ALIPAY_FIX_VOUCHER"
			}
		],
		"out_trade_no":"6823789339978248",
		"total_amount":120.88,
		"business_params":"{\"data\":\"123\"}",
		"buyer_user_type":"PRIVATE",
		"trade_no":"2013112011001004330000121536",
		"store_name":"证大五道口店",
		"buyer_logon_id":"159****5620",
		"receipt_amount":"88.88",
		"point_amount":8.12,
		"discount_goods_detail":"[{\"goods_id\":\"STANDARD1026181538\",\"goods_name\":\"雪碧\",\"discount_amount\":\"100.00\",\"voucher_id\":\"2015102600073002039000002D5O\"}]",
		"buyer_pay_amount":8.88
	},
	"sign":"ERITJKEIJKJHKKKKKKKHJEREEEEEEEEEEE"
}

{
	"alipay_trade_pay_response":{
		"msg":"Service Currently Unavailable",
		"code":"20000",
		"sub_msg":"系统繁忙",
		"sub_code":"isp.unknow-error"
	},
	"sign":"ERITJKEIJKJHKKKKKKKHJEREEEEEEEEEEE"
}

https://www.merchant.com/receive_notify.htm?notify_type=trade_status_sync&notify_id=91722adff935e8cfa58b3aabf4dead6ibe&notify_time=2017-02-16 21:46:15&sign_type=RSA2&sign=WcO+t3D8Kg71dTlKwN7r9PzUOXeaBJwp8/FOuSxcuSkXsoVYxBpsAidprySCjHCjmaglNcjoKJQLJ28/Asl93joTW39FX6i07lXhnbPknezAlwmvPdnQuI01HZsZF9V1i6ggZjBiAd5lG8bZtTxZOJ87ub2i9GuJ3Nr/NUc9VeY=&notify_action_type=payByAccountAction/closeTradeAction/reverseAction/finishFPAction&discount_amount=88.88&mdiscount_amount=88.88&unfreeze_amount=18.18&auth_trade_pay_mode=CREDIT_PREAUTH_PAY