AlipayClient alipayClient = new DefaultAlipayClient("https://openapi.alipay.com/gateway.do","app_id","your private_key","json","GBK","alipay_public_key","RSA2");
ZhimaCustomerContractInitializeRequest request = new ZhimaCustomerContractInitializeRequest();
request.setBizContent("{" +
"\"product_code\":\"w1010100000000002978\"," +
"\"contract_name\":\"《XXXXX合同》\"," +
"\"contract_file\":\"JVBERi0xLjUNCjQgMCBvYmoNCjw8L1R5cGUgL1BhZ2UvUGFyZW50IDMgMCBSL0NvbnRlbnRzIDUgMCBSL01lZGlhQm94IFswIDAgNTk1LjI5OTk4Nzc5IDg0MS45MDAw\"" +
"  }");
ZhimaCustomerContractInitializeResponse 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);
ZhimaCustomerContractInitializeRequest  request= new ZhimaCustomerContractInitializeRequest() ;
request.BizContent="{" +
"\"product_code\":\"w1010100000000002978\"," +
"\"contract_name\":\"《XXXXX合同》\"," +
"\"contract_file\":\"JVBERi0xLjUNCjQgMCBvYmoNCjw8L1R5cGUgL1BhZ2UvUGFyZW50IDMgMCBSL0NvbnRlbnRzIDUgMCBSL01lZGlhQm94IFswIDAgNTk1LjI5OTk4Nzc5IDg0MS45MDAw\"" +
"  }";
ZhimaCustomerContractInitializeResponse 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 ZhimaCustomerContractInitializeRequest ();
$request->setBizContent("{" .
"\"product_code\":\"w1010100000000002978\"," .
"\"contract_name\":\"《XXXXX合同》\"," .
"\"contract_file\":\"JVBERi0xLjUNCjQgMCBvYmoNCjw8L1R5cGUgL1BhZ2UvUGFyZW50IDMgMCBSL0NvbnRlbnRzIDUgMCBSL01lZGlhQm94IFswIDAgNTk1LjI5OTk4Nzc5IDg0MS45MDAw\"" .
"  }");
$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=zhima.customer.contract.initialize&app_id=4779&sign_type=RSA2&sign=ERITJKEIJKJHKKKKKKKHJEREEEEEEEEEEE&version=1.0&biz_content=
  {
"product_code":"w1010100000000002978",
"contract_name":"《XXXXX合同》",
"contract_file":"JVBERi0xLjUNCjQgMCBvYmoNCjw8L1R5cGUgL1BhZ2UvUGFyZW50IDMgMCBSL0NvbnRlbnRzIDUgMCBSL01lZGlhQm94IFswIDAgNTk1LjI5OTk4Nzc5IDg0MS45MDAw"
  }

//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。

{
	"sign":"ERITJKEIJKJHKKKKKKKHJEREEEEEEEEEEE",
	"zhima_customer_contract_initialize_response":{
		"msg":"Success",
		"contract_no":"e31b9cde3216dca1394cf4fa73e464e6",
		"code":"10000"
	}
}

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