Are you stuck with integrating a payment gateway into your project? If Yes, here learn how to Integrate Paytm Payment Gateway using ReactJS in this guide.

1. How to
Integrate
Paytm Payment
Gateway using
ReactJS in
Seven Easy
Steps
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2. Introduction
01

3. Are you stuck with a requirement of
integrating a payment gateway into your
project? Are you aggressively looking for a
simple tutorial regarding the same? If yes,
this tutorial: Integrate Paytm payment
gateway using ReactJs is for you! In this
step-by-step guide, we will learn how to
implement a payment gateway in seven
easy steps. So, without further ado, let’s get
started with our tutorial.
02

4. Tutorial Goal:
Integrate
Paytm
Payment
Gateway
using ReactJS
03

5. You might be wondering what we are going
to do in this tutorial. We will build a small
demo application consisting of a button
‘Pay Now’. With the click of the button a
modal will be displayed as shown below.
The library allows you to customize the
modal and add various payment methods
the way you want.
04

6. Create a new
Paytm
developer
account
05

7. We would need to create new secret keys by
creating a new developer account.
Go to https://developer.paytm.com/, login if
you are already a Paytm user, or you can
create a new account.
06

8. Collect the
API keys
07

9. Once you are logged in successfully, you can
directly go to Dashboard and check the Test
API Details. Feel free to test the APIs using
the test API keys.
08

10. Create a
ReactJS
Application
09

11. Use the following command to create a new
reactJs application.
A new project would be created with the
default folder structure as shown below.
create-react-app < app - name >
10

12. Adding the
scripts to
index.html
11

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< script type=”text/javascript”
crossorigin=”anonymous”
src=”https://securegw-
stage.paytm.in/merchantpgpui/checkoutjs/
merchants/.js” >< /script >
You need to link the Paytm library using the
script tag in public/index.html file. For that
use the below snippet.
12

14. Logic & UI:
Paytm
Payment
Integration
13

15. Create a new file paytmButton.js inside
/paytm-button folder. This file will contain
the main logic and functionality for the
Paytm payment integration using ReactJS.
The user interface would have a “Pay Now”
button that will trigger the Paytm checkout
modal.
Create a new function initializePaytm() that
will contain all the initialization
configurations and token generation steps
that will be triggered on page load using
useEffect.
useEffect(() => {
initialize();
}, []);
14

16. The initializePaytm() function will make use
of the Paytm checksum file and it will
generate a token.
const initialize = () => {
let orderId = "Order_" + new
Date().getTime();
// Sandbox Credentials
let mid = ""; // Merchant ID
let mkey = ""; // Merchant Key
var paytmParams = {};
paytmParams.body = {
requestType: "Payment",
mid: mid,
websiteName: "WEBSTAGING",
orderId: orderId,
callbackUrl:
"https://merchant.com/callback",
txnAmount: {
value: 100,
currency: "INR",
},
15

17. userInfo: {
custId: "1001",
},
};
PaytmChecksum.generateSignature(
JSON.stringify(paytmParams.body),
mkey
).then(function (checksum) {
console.log(checksum);
paytmParams.head = {
signature: checksum,
};
var post_data =
JSON.stringify(paytmParams);
var options = {
/* for Staging */
// hostname: "securegw-stage.paytm.in"
/* for Production */,
hostname: "securegw.paytm.in",
16

18. port: 443,
path: `/theia/api/v1/initiateTransaction?
mid=${mid}&orderId=${orderId}`,
method: "POST",
headers: {
"Content-Type": "application/json",
"Content-Length": post_data.length,
},
};
var response = "";
var post_req = https.request(options,
function (post_res) {
post_res.on("data", function (chunk) {
response += chunk;
});
post_res.on("end", function () {
console.log("Response: ", response);
// res.json({data: JSON.parse(response),
orderId: orderId, mid: mid, amount:
amount});
setPaymentData({
17

19. ...paymentData,
token:
JSON.parse(response).body.txnToken,
order: orderId,
mid: mid,
amount: 100,
});
});
});
post_req.write(post_data);
post_req.end();
});
};
18

20. Explanation
19

21. This method is called on page load
which will return a transaction token
from Paytm which will be later used for
initiating the Paytm checkout modal.
To retrieve the token, we will make an
API call to
/theia/api/v1/initiateTransaction which
will expect a basic transaction object in
the request body along with a hashed
value created using the transaction
object. The paytmParam.body is a
transaction object with basic fields like
orderId, value, and currency.
paytmParams.body = { ... };
20

22. A hash value should be using this
transaction object. For that Paytm
provides a library – PaytmChecksum
using which we can generate a hashed
value by passing the transaction object
as arguments.
This hash value will be sent along with
the transaction object in the
initiateTransaction API and will provide
the transaction token in response. Later
this token will be used when the user
clicks on the ‘Pay Now’ button and will
be helpful for triggering the payment
checkout modal.
PaytmChecksum.generateSignature(
JSON.stringify(paytmParams.body),mkey
).then(function(checksum){ ... // logic }
21

23. Create a new function makePayment() that
will be triggered on click of the button,
which will use the already generated token
and display the checkout modal to the user.
In this function, you can modify the style of
the Paytm checkout modal and change the
color code and add your logo.
const makePayment = () => {
var config = {
"root":"",
"style": {
"bodyBackgroundColor": "#fafafb",
"bodyColor": "",
"themeBackgroundColor":
"#0FB8C9",
"themeColor": "#ffffff",
"headerBackgroundColor": "#284055",
"headerColor": "#ffffff",
"errorColor": "",
"successColor": "",
22

24. "card": {
"padding": "",
"backgroundColor": ""
}
},
"data": {
"orderId": paymentData.order,
"token": paymentData.token,
"tokenType": "TXN_TOKEN",
"amount": paymentData.amount /*
update amount */
},
"payMode": {
"labels": {},
"filter": {
"exclude": []
},
23

25. "order": [
"CC",
"DC",
"NB",
"UPI",
"PPBL",
"PPI",
"BALANCE"
]
},
"website": "WEBSTAGING",
"flow": "DEFAULT",
"merchant": {
"mid": paymentData.mid,
"redirect": false
},
"handler": {
"transactionStatus":
function transactionStatus(paymentStatus){
console.log(paymentStatus);
},
24

26. "notifyMerchant":
function notifyMerchant(eventName,data){
console.log("Closed");
}
}
};
if (window.Paytm &&
window.Paytm.CheckoutJS) {
window.Paytm.CheckoutJS.init(config).
then(function onSuccess() {
window.Paytm.CheckoutJS.invoke();
}).catch(function onError(error) {
console.log("Error => ", error);
});
}}
25

27. Call the makePayment() method on click
event of the button.
return (
< div >
{loading ? (
< img src="https://c.tenor.com/I6kN-
6X7nhAAAAAj/loading-buffering.gif" / >
) : (
< button onClick={makePayment}>Pay
Now< /button >
)}
< /div >
);
26

28. Import
PaytmButton
in App.js
27

29. Once we are done with the main logic
implementation it’s time to import the file
into App.js.
import "./App.css";
import { PaytmButton } from "./paytm-
button/paytmButton";
function App() {
return (
< div >
< PaytmButton / >
< /div >
);
}
export default App;
28

30. Run the
Server
29

31. So, finally, we are done with the tutorial:
How to Integrate Paytm Payment Gateway
using ReactJS. Now using the below
command, run your server.
npm start
Visit http://localhost:3000/ and test the
demo app.
The entire source code is available on the
github repo: paytm-payment-gateway-
integration. Feel free to clone the repository
and play around with the code.
30

32. Conclusion
31

33. I hope the tutorial has helped you learn how
to integrate Paytm payment gateway using
ReactJS. We value your feedback and
suggestions, so feel free to write back. Our
team is trying to explore and add more such
topics to ReactJS tutorials. If you are a
ReactJS enthusiast, visit the ReactJS
tutorials page without wasting your time,
clone the github repository, and polish your
technical side.
32

34. Thank You
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