PayUMoney Integration In Android

Introduction

This article demonstrates how to integrate PayUMoney SDK in Android application. With the help of this SDK, the Android application would be able to make electronic payments through Debit card, Credit card, and Netbanking.

Transaction status

A transaction can have different states. Some of them are as follows.

• Not Started
• Initiated
• Under Dispute
• Refunded
• Bounced
• Failed
• Completed

Integrating SDK in Android Project

• Click "Project Structure" under "File" menu.
• Click on "+" button to add new module.
• Select "Import Gradle Project".
  
  
  
  
• Browse and select "PayUMoney SDK".

For adding this as dependency in your project, please follow the steps given below.

• Click on File->Project Structure.
• Select your project and go to "Dependencies" tab.
• Click "+" on the top right corner and select "Module dependency".
• Select "PayUMoney".

Now, we need to contact PayUMoney for getting our Merchant Id and Key.

In our application, there will be one button for initiating the payment. On click of that button, we need to call the PayUMoney SDK with some parameters, as given below.

Parameter	Required	Value
key	Yes	Merchant key from PayUMoney
Txnid	Yes	Unique id
Amount	Yes	Amount to be collected from user
ProductInfo	Yes	Description about product
FirstName	Yes	First name of user
Email	Yes	Email id o f the user
phone	Yes	Phone number of the user
Udf1		User defined field 1
Udf2		User defined field 2
Udf3		User defined field 3
Udf4		User defined field 4
udf5		User defined field 5
SURL	yes	Success url to be called after payment success
FURL	yes	Failure url to be called after payment Failure
hash	yes	Hash or Checksum =sha512(key|txnid|amount|productinfo|firstname|email |udf1|udf2|udf3|udf4|udf5|salt) (SALT will be provided by PayUmoney)

Udf1 to udf5 are user defined fields; these can have any values if the user wants to post any additional data.

Hash Calculation 

String hashSequence = key|txnid|amount|productinfo|firstname|email|udf1|udf2|udf3|udf4|udf5|salt;

The following function will calculate the hash code.

public static String hashCal(String str) {
    byte[] hashseq = str.getBytes();
    StringBuilder hexString = new StringBuilder();
    try {
        MessageDigest algorithm = MessageDigest.getInstance("SHA-512");
        algorithm.reset();
        algorithm.update(hashseq);
        byte messageDigest[] = algorithm.digest();
        for (byte aMessageDigest : messageDigest) {
            String hex = Integer.toHexString(0xFF & aMessageDigest);
            if (hex.length() == 1) {
                hexString.append("0");
            }
            hexString.append(hex);
        }
    } catch (NoSuchAlgorithmException ignored) {
    }
    return hexString.toString();
}

On the "Pay Money" button click of your application, please write the following code.

PayUmoneySdkInitilizer.PaymentParam.Builder builder = new PayUmoneySdkInitilizer.PaymentParam.Builder();
builder.setAmount(getAmount())
        .setTnxId(getTxnId())
        .setPhone("9895473514")
        .setProductName("ice cream")
        .setFirstName("pranav")
        .setEmail("[email protected]")
        .setsUrl("https://www.payumoney.com/mobileapp/payumoney/success.php")
        .setfUrl("https://www.payumoney.com/mobileapp/payumoney/failure.php")
        .setUdf1("")
        .setUdf2("")
        .setUdf3("")
        .setUdf4("")
        .setUdf5("")
        .setIsDebug(true)//should be false in production
        .setKey("dRQuiA")
        .setMerchantId("4928174");// Debug Merchant ID
PayUmoneySdkInitilizer.PaymentParam paymentParam = builder.build();
calculateServerSideHashAndInitiatePayment(paymentParam);

Here, we are calculating the hash code from the Server itself.

private void calculateServerSideHashAndInitiatePayment(final PayUmoneySdkInitilizer.PaymentParam paymentParam) {
    // Replace your server side hash generator API URL
    String url = "https://test.payumoney.com/payment/op/calculateHashForTest";
    Toast.makeText(this, "Please wait... Generating hash from server ... ", Toast.LENGTH_LONG).show();
    StringRequest jsonObjectRequest = new StringRequest(Request.Method.POST, url, new Response.Listener<String>() {
        @Override
        public void onResponse(String response) {
            try {
                JSONObject jsonObject = new JSONObject(response);
                if (jsonObject.has(SdkConstants.STATUS)) {
                    String status = jsonObject.optString(SdkConstants.STATUS);
                    if (status != null || status.equals("1")) {
                        String hash = jsonObject.getString(SdkConstants.RESULT);
                        Log.i("app_activity", "Server calculated Hash :  " + hash);
                        paymentParam.setMerchantHash(hash);
                        PayUmoneySdkInitilizer.startPaymentActivityForResult(MyActivity.this, paymentParam);
                    } else {
                        Toast.makeText(MyActivity.this,
                                jsonObject.getString(SdkConstants.RESULT),
                                Toast.LENGTH_SHORT).show();
                    }
                }
            } catch (JSONException e) {
                e.printStackTrace();
            }
        }
    }, new Response.ErrorListener() {
        @Override
        public void onErrorResponse(VolleyError error) {
            if (error instanceof NoConnectionError) {
                Toast.makeText(MyActivity.this,
                        MyActivity.this.getString(R.string.connect_to_internet),
                        Toast.LENGTH_SHORT).show();
            } else {
                Toast.makeText(MyActivity.this,
                        error.getMessage(),
                        Toast.LENGTH_SHORT).show();
            }
        }
    }) {
        @Override
        protected Map<String, String> getParams() throws AuthFailureError {
            return paymentParam.getParams();
        }
    };
    Volley.newRequestQueue(this).add(jsonObjectRequest);
}

Here, we are calling PayUmoneySdkInitilizer.startPaymentActivityForResult(MyActivity.this, paymentParam); to perform the transaction.

And after the payment is completed, the onActivityResult method will be called. There, we can show the response to the user.

protected void onActivityResult(int requestCode, int resultCode, Intent data) {
    if (requestCode == PayUmoneySdkInitilizer.PAYU_SDK_PAYMENT_REQUEST_CODE) {
        if (resultCode == RESULT_OK) {
            Log.i(TAG, "Success - Payment ID : " + data.getStringExtra(SdkConstants.PAYMENT_ID));
            String paymentId = data.getStringExtra(SdkConstants.PAYMENT_ID);
            showDialogMessage("Payment Success Id : " + paymentId);
        } else if (resultCode == RESULT_CANCELED) {
            Log.i(TAG, "failure");
            showDialogMessage("cancelled");
        } else if (resultCode == PayUmoneySdkInitilizer.RESULT_FAILED) {
            Log.i("app_activity", "failure");
            if (data != null) {
                if (data.getStringExtra(SdkConstants.RESULT).equals("cancel")) {
                } else {
                    showDialogMessage("failure");
                }
            }
            //Write your code if there's no result
        } else if (resultCode == PayUmoneySdkInitilizer.RESULT_BACK) {
            Log.i(TAG, "User returned without login");
            showDialogMessage("User returned without login");
        }
    }
}

Summary

In this article, I have discussed how to integrate PayUMoney SDK in an Android application .