转到链接：

和下载Android + SDK

and download Android+SDK

下面放code。在您的函数或要开始paytm的东西。

put below code in your function or where you want to start paytm stuff.

    private int randomInt = 0;
    private PaytmPGService Service = null;

    Random randomGenerator = new Random();
    randomInt = randomGenerator.nextInt(1000);
    //for testing environment   
    Service = PaytmPGService.getStagingService();
    //for production environment 
    /*Service = PaytmPGService.getProductionService();*/ 

    /*PaytmMerchant constructor takes two parameters
    1) Checksum generation url
    2) Checksum verification url
    Merchant should replace the below values with his values*/


PaytmMerchant Merchant = new PaytmMerchant("https://pguat.paytm.com/merchant-chksum/ChecksumGenerator","https://pguat.paytm.com/merchant-chksum/ValidateChksum");

    //below parameter map is required to construct PaytmOrder object, Merchant should replace below map values with his own values

    Map<String, String> paramMap = new HashMap<String, String>();

        //these are mandatory parameters
        paramMap.put("REQUEST_TYPE", "DEFAULT");
        paramMap.put("ORDER_ID", String.valueOf(randomInt));
        //MID provided by paytm
        paramMap.put("MID", "id provided by paytm");
        paramMap.put("CUST_ID", "CUST123");
        paramMap.put("CHANNEL_ID", "WAP");
        paramMap.put("INDUSTRY_TYPE_ID", "Retail");
        paramMap.put("WEBSITE", "paytm");
        paramMap.put("TXN_AMOUNT", "1");
        paramMap.put("THEME", "merchant");          

        PaytmOrder Order = new PaytmOrder(paramMap);


Service.initialize(Order, Merchant,null);
        Service.startPaymentTransaction(activity, false, false, new PaytmPaymentTransactionCallback() {
        @Override
        public void onTransactionSuccess(Bundle bundle) {
            app.getLogger().error("Transaction Success :" + bundle);
        }

        @Override
        public void onTransactionFailure(String s, Bundle bundle) {
            app.getLogger().error("Transaction Failure :" + s + "\n" + bundle);
        }

        @Override
        public void networkNotAvailable() {
            app.getLogger().error("network unavailable :");
        }

        @Override
        public void clientAuthenticationFailed(String s) {
            app.getLogger().error("clientAuthenticationFailed :" + s);
        }

        @Override
        public void someUIErrorOccurred(String s) {
            app.getLogger().error("someUIErrorOccurred :" + s);
        }

        @Override
        public void onErrorLoadingWebPage(int i, String s, String s2) {
            app.getLogger().error("errorLoadingWebPage :" + i + "\n" + s + "\n" + s2);
        }
    });
    }

还有另一件事是，你需要在AndroidManifest.xml文件中声明了一个活动：

Also another thing is you need to declare one activity in AndroidManifest.xml file:

<activity
            android:name="com.paytm.pgsdk.PaytmPGActivity"
            android:theme="@style/AppTheme"
            android:screenOrientation="portrait"
            android:windowSoftInputMode="stateHidden"/>

希望以上code样本将帮助ü很多。 还有另外一件事是，当你下载的Andr​​oid + SDK，你会得到你需要在你的项目和MainActivity.java类文件供我们参考添加一个jar文件pgsdk.jar文件。享受！

Hope above code sample will help u lot. Also another thing is when you download Android+SDK you will get one jar file pgsdk.jar file that you need to add in your project and MainActivity.java class file for our reference. Enjoy!!!

注：ChecksumGenerator和ValidateChksum的网址是只是测试它是由paytm开发支持团队提供目的

Note: ChecksumGenerator and ValidateChksum urls are for just testing purpose which is provided by paytm development support team