alipayclient alipayclient = new defaultalipayclient("https://openapi.alipay.com/gateway.do","第三方应用appid","第三方应用私钥 private_key","json","gbk","第三方应用alipay_public_key","rsa2");

alipaysystemoauthtokenrequest request = new alipaysystemoauthtokenrequest();

request.putothertextparam("app_auth_token", "201903bb61c87d68fee1456cac3bb65b6d515d88"); // 注:三方代小程序调用接口必须传入app_auth_token

alipaysystemoauthtokenresponse response = alipayclient.execute(request);

} else {

$aop = new aopclient ();

$aop->gatewayurl = 'https://openapi.alipay.com/gateway.do';

$aop->appid = '第三方应用 app_id';

$aop->rsaprivatekey = '第三方应用私钥';

$aop->apiversion = '1.0';

$aop->signtype = 'rsa2';

$request = new alipaysystemoauthtokenrequest ();

$result = $aop->execute ( $request, null, app_auth_token); // 注:第三方应用代小程序调用接口必须传入app_auth_token

$responsenode = str_replace(".", "_", $request->getapimethodname()) . "_response";

$resultcode = $result->$responsenode->code;

if(!empty($resultcode)&&$resultcode != 10000){

echo "失败";

} else {

echo "成功";

iaopclient client = new defaultaopclient("https://openapi.alipay.com/gateway.do", "第三方应用app_id", "第三方应用私钥merchant_private_key", "json", "1.0", "rsa2", "第三方应用支付宝公钥alipay_public_key", "gbk", false);

alipaysystemoauthtokenrequest request= new alipaysystemoauthtokenrequest() ;

request.granttype = "authorization_code";

request.code = "4b203fe6c11548bcabd8da5bb087a83b";

alipaysystemoauthtokenresponse response=client.execute(request,null,app_auth_token)//注:第三方应用代小程序调用接口必须传入app_auth_token

console.writeline(response.body);