express - 通过 paypal 快速结账定期订阅，买家支付两次

Question

我在我的网站上创建了每月订阅的定期付款。用户将每月付款。但我看到买家为订阅支付了两次费用，一次用于启动，一次用于重复。我读了https://developer.paypal.com/docs/classic/api/merchant/DoExpressCheckoutPayment_API_Operation_NVP/ ，我们可以在此设置 PAYMENTREQUEST_n_AMT = 0 和 SetExpressCheckout 以忽略发起付款。但是当我将它设置为 0 时，我会收到金额为零的错误消息，因此我可以完成结帐。我怎样才能创建无偿重复两次。我尝试跳过 DoExpressCheckoutPayment 方法，但是通过这种方式，我无法获取交易 ID

Answer 1

以下是我的应用程序代码，首先我调用 setExpressCheckout() 而不是 getExpressCheckoutDetails()

比使用这段代码支付和生成个人资料收到 token

if(request.getParameter("token")!= null && request.getParameter("PayerID") != null){
            if(token.contentEquals(request.getParameter("token"))/* && payerID.contentEquals(request.getParameter("PayerID"))*/){
                this.payerID = request.getParameter("PayerID");

                if(doExpressCheckout()){
                    if(createRecurringProfile()){
                        //some notification showing successful order
                        log.debug("Trasaction status : Successfull");
                        license.setProfileID(profileID);
                        license.setActive(true);
                        license.setLicenseType(LicenseBean.PAYMENT_RECURRING);
                        ApplicationInstance.getCurrent().fireEvent("SaveLicense", description, license,false);
                        ApplicationInstance.getCurrent().fireEvent("DisplayLicenseDetails", "Success", license,false);
                    }

以下是四种方法

public String setExpressCheckout() {
    NVPEncoder encoder = new NVPEncoder();
    NVPDecoder decoder = new NVPDecoder();

    try
    {           

        encoder.add("VERSION", "86.0");         
        encoder.add("METHOD","SetExpressCheckout");
        encoder.add("L_BILLINGTYPE0","RecurringPayments");   
        encoder.add("L_BILLINGAGREEMENTDESCRIPTION0","UserPack");
        // Add request-specific fields to the request string.
        encoder.add("RETURNURL",returnURL);
        encoder.add("CANCELURL",cancelURL); 
        encoder.add("AMT",cost);
        encoder.add("PAYMENTACTION",paymentAction.getValue());
        encoder.add("CURRENCYCODE",currencyCode.getValue());

        // Execute the API operation and obtain the response.
        String NVPRequest= encoder.encode();
        String NVPResponse =caller.call(NVPRequest);
        decoder.decode(NVPResponse);

    } 
    catch(PayPalException pe){
        log.error("Paypal Exception:", pe.getCause());
    }
    catch (Exception ex)
    {
        log.error(ex);
    }
    return decoder.get("TOKEN");
}

public boolean getExpressCheckoutDetails(String token)
{

    NVPEncoder encoder = new NVPEncoder();
    NVPDecoder decoder = new NVPDecoder();

    try
    {
        encoder.add("VERSION", "86.0");
        encoder.add("METHOD", "GetExpressCheckoutDetails");

        // Add request-specific fields to the request string.
        // Pass the token value returned in SetExpressCheckout.
        encoder.add("TOKEN", token);

        // Execute the API operation and obtain the response.
        String NVPRequest = encoder.encode();
        String NVPResponse = caller.call(NVPRequest);
        decoder.decode(NVPResponse);
        //          payerID = decoder.get("PAYERID");
        payerName = decoder.get("PAYERNAME");

    }catch (Exception ex)
    {
        log.error(ex);
    }

    if(decoder.get("ACK").toLowerCase().contains("success")){
        this.token = token;
        return true;
    }
    else{
        return false;
    }
}

public boolean createRecurringProfile() 
{
    NVPEncoder encoder = new NVPEncoder();
    NVPDecoder decoder = new NVPDecoder();

    try
    {
        encoder.add("VERSION", "86.0");
        encoder.add("METHOD","CreateRecurringPaymentsProfile");

        encoder.add("DESC","UserPack");//    #Profile description - same as billing agreement description
        encoder.add("BILLINGPERIOD","Month");//    #Period of time between billings
        encoder.add("BILLINGFREQUENCY","1");//    #Frequency of charges 

        //          encoder.add("INITAMT","25.29");
        //          encoder.add("FAILEDINITAMTACTION","ContinueOnFailure");

        // Add request-specific fields to the request string.
        // Pass the token value by actual value returned in the SetExpressCheckout.
        encoder.add("TOKEN",token);
        encoder.add("PAYERID",payerID);
        Date localTime = new Date(); 
        //creating DateFormat for converting time from local timezone to GMT(as specified in paypal)
        DateFormat converter = new SimpleDateFormat("yyyy-MM-dd'T'HH:mm:ss'Z'");

        encoder.add("PROFILESTARTDATE",converter.format(localTime));//SimpleDateFormat.getTimeInstance().format(new Date())

        encoder.add("AMT",cost);
        encoder.add("CURRENCYCODE","USD");//    #The currency, e.g. US dollars
        encoder.add("COUNTRYCODE","US");//    #The country code, e.g. US  
        encoder.add("MAXFAILEDPAYMENTS","3");
        //          encoder.add("PAYMENTACTION",paymentAction.getValue());
        encoder.add("CURRENCYCODE",currencyCode.getValue());
        // Execute the API operation and obtain the response.
        String NVPRequest = encoder.encode();
        String NVPResponse =caller.call(NVPRequest);
        decoder.decode(NVPResponse);
        profileID = decoder.get("PROFILEID");
        profileStatus = decoder.get("PROFILESTATUS");
        //transactionID = decoder.get("TRANSACTIONID");
        paymentDate = decoder.get("PAYMENTDATE");
        log.debug("Paypal acknowledgement: "+decoder.get("ACK"));
        //System.out.println("Paypal acknowledgement: "+decoder.get("ACK"));
    } 
    catch(PayPalException pe){
        log.error("Paypal Exception:", pe.getCause());
    }
    catch(Exception ex)
    {
        log.error("Error :",ex.getCause());
    }

    if(decoder.get("ACK").toLowerCase().contains("success")){
        return true;
    }
    else{
        //System.out.println("Paypal error: "+decoder.get("L_SHORTMESSAGE0"));
        log.error("Paypal error: "+decoder.get("L_SHORTMESSAGE0"));
        return false;
    }
}


public boolean doExpressCheckout() 
{
    NVPEncoder encoder = new NVPEncoder();
    NVPDecoder decoder = new NVPDecoder();

    try
    {
        encoder.add("VERSION", "51.0");
        encoder.add("METHOD","DoExpressCheckoutPayment");

        // Add request-specific fields to the request string.
        // Pass the token value by actual value returned in the SetExpressCheckout.
        encoder.add("TOKEN",token);
        encoder.add("PAYERID",payerID);
        encoder.add("AMT",cost);
        encoder.add("PAYMENTACTION",paymentAction.getValue());
        encoder.add("CURRENCYCODE",currencyCode.getValue());
        // Execute the API operation and obtain the response.
        String NVPRequest = encoder.encode();
        String NVPResponse =caller.call(NVPRequest);
        decoder.decode(NVPResponse);
        //transactionID = decoder.get("TRANSACTIONID");
        paymentDate = decoder.get("PAYMENTDATE");
        log.debug("Paypal acknowledgement: "+decoder.get("ACK"));
        //System.out.println("Paypal acknowledgement: "+decoder.get("ACK"));
    } 
    catch(PayPalException pe){
        log.error("Paypal Exception:", pe.getCause());
    }
    catch(Exception ex)
    {
        log.error("Error :",ex.getCause());
    }

    if(decoder.get("ACK").toLowerCase().contains("success")){
        return true;
    }
    else{
        //System.out.println("Paypal error: "+decoder.get("L_SHORTMESSAGE0"));
        log.error("Paypal error: "+decoder.get("L_SHORTMESSAGE0"));
        return false;
    }
}