Paytm Payment Gateway Through SDK In Swift

Ranjit Kumar

2 December 2020

Overview of Paytm checkout process

At the click of the pay button by the customer, order-related payload is passed to your server by the app
This order payload is used to generate checksumhash by our server side utility and merchant key on your server. Paytm use Checksumhash signature to ensure that request has not been tampered. Utility to generate checksumhash is available here
Your server passes the payload and checksumhash back to the app which hands over these details to Paytm SDK
SDK verifies payload and displays payment Paytm checkout page
Customer fills the payment details and completes the payment authentication. you will get payment status with the callback, after payment complete
Verify checksumhash received in response on your server side.
Lastly, verify transaction status with Transaction Status API via server to server call.

Step to implement payment gateway through sdk.

1. Download sdk from here

2. Add this sdk to your project

3. Import in the class where you want to accept payment through SDK

Start implementing with the code

Initialized the payment checkout process

Import the paytm library

import AppInvokeSDK

1	import AppInvokeSDK

 private let handler = AIHandler()

1	private let handler = AIHandler()

let mid = "merchant Id"
        let orderId = "order Id"
        let txnToken = "tax"
        let amount = "product amount"
        let callback = "where you want to reace after payment"
        let environment: AIEnvironment = () ? .production : .staging

let mid = "merchant Id"

let orderId = "order Id"

let txnToken = "tax"

let amount = "product amount"

let callback = "where you want to reace after payment"

let environment: AIEnvironment = () ? .production : .staging

Present the payment controller

self.handler.openPaytm(merchantId: mid, orderId: orderId, txnToken: txnToken, amount: amount, callbackUrl: callback, delegate: self, environment: environment)

1	self.handler.openPaytm(merchantId: mid, orderId: orderId, txnToken: txnToken, amount: amount, callbackUrl: callback, delegate: self, environment: environment)

Add paytm delegate in your project which will use handle the payment status (failer or seccess)

extension ViewController: AIDelegate {
    func didFinish(with status: AIPaymentStatus, response: [String : Any]) {
        print("Paytm Callback Response: ", response)
        self.showAlert(title: "\(status)", message:  String(describing: response))
    }
    
    func openPaymentWebVC(_ controller: UIViewController?) {
        if let vc = controller {
            DispatchQueue.main.async {[weak self] in
                self?.present(vc, animated: true, completion: nil)
            }
        }
    }
}

extension ViewController: AIDelegate {

func didFinish(with status: AIPaymentStatus, response: [String : Any]) {

print("Paytm Callback Response: ", response)

self.showAlert(title: "\(status)", message: String(describing: response))

}

func openPaymentWebVC(_ controller: UIViewController?) {

if let vc = controller {

DispatchQueue.main.async {[weak self] in

self?.present(vc, animated: true, completion: nil)

}

Show the payment status through the alert

func showAlert(title: String?, message: String?) {
        let alert = UIAlertController(title: title, message: message, preferredStyle: .alert)
        alert.addAction(UIAlertAction(title: "OK", style: .default, handler: nil))
        DispatchQueue.main.async {
            self.present(alert, animated: true, completion: nil)
        }
    }

func showAlert(title: String?, message: String?) {

let alert = UIAlertController(title: title, message: message, preferredStyle: .alert)

alert.addAction(UIAlertAction(title: "OK", style: .default, handler: nil))

DispatchQueue.main.async {

self.present(alert, animated: true, completion: nil)

}

Conclusion –

In this blog we have discussed about how do we checkout through paytm

I hope this blog will help you in getting some basic knowledge about the paytm checkout

For more technical blog please click here

Thanks for reading!