Gpay payment-gateway integration in NodeJS - node.js

Question

I tried it in Html and Javascript it's working perfect in web (mobile's browser).I am using angular for frontend and node for backend but not getting any proper solution for redirect Playstore or Gpay for mobile browser. Basically I want to implement for mobile browser.
this is my node for backend code & for frontend I already paste static. So, request you that please check & get back to me proper resolution or tutorial. Thanks & Regards--
const canMakePaymentCache = 'canMakePaymentCache';
onBuyClicked();
function readSupportedInstruments() {
let formValue = {};
formValue['pa'] = keys.GPAY_MERCHANT_ID;//merchantId
formValue['pn'] = `Test_Gpay_Name`;//transactionId
formValue['tn'] = 'Testing Messages ';//message
formValue['mc'] = 'merchant Code';//
formValue['tr'] = 'Transaction Reference';
formValue['tid'] = 'Transaction id';
formValue['url'] = 'http://localhost.co/';
return formValue;
}
function readAmount() {
//const pay_amount = parseInt(req.body.amount) * 100;
return parseInt(req.body.amount) * 100;
}
function onBuyClicked() {
// if (!window.PaymentRequest) {
// console.log('Web payments are not supported in this browser.');
// return;
// }
let formValue = readSupportedInstruments();
const supportedInstruments = [
{
supportedMethods: ['https://pwp-server.appspot.com/pay-dev'],
data: formValue,
},
{
supportedMethods: ['https://tez.google.com/pay'],
data: formValue,
},
];
const details = {
total: {
label: 'Total',
amount: {
currency: 'INR',
value: readAmount(),
},
},
displayItems: [
{
label: 'Original amount',
amount: {
currency: 'INR',
value: readAmount(),
},
},
],
};
const options = {
requestShipping: false,
requestPayerName: false,
requestPayerPhone: false,
requestPayerEmail: false,
shippingType: 'shipping',
};
let request = null;
try {
//const PaymentRequest = {};
//request = PaymentRequest(supportedInstruments, details, options);
request ={supportedInstruments, details, options};
} catch (e) {
return;
}
if (!request) {
console.log('Web payments are not supported in this browser.');
return;
}
var canMakePaymentPromise = checkCanMakePayment(request);
canMakePaymentPromise
.then((result) => {
showPaymentUI(request, result);
})
.catch((err) => {
console.log('Error calling checkCanMakePayment: ' + err);
});
}
function checkCanMakePayment(request) {
//if (sessionStorage.hasOwnProperty(canMakePaymentCache)) {
//return Promise.resolve(JSON.parse(sessionStorage[canMakePaymentCache]));
//}
var canMakePaymentPromise = Promise.resolve(true);
if (request.canMakePayment) {
canMakePaymentPromise = request.canMakePayment();
}
return canMakePaymentPromise
.then((result) => {
canMakePaymentCache = result;
return result;
})
.catch((err) => {
console.log('Error calling canMakePayment: ' + err);
});
}
function showPaymentUI(request, canMakePayment) {
if (!canMakePayment) {
redirectToPlayStore();
return;
}
let paymentTimeout = window.setTimeout(function () {
window.clearTimeout(paymentTimeout);
request.abort()
.then(function () {
console.log('Payment timed out after 20 minutes.');
})
.catch(function () {
console.log('Unable to abort, user is in the process of paying.');
});
}, 20 * 60 * 1000); /* 20 minutes */
request.show()
.then(function (instrument) {
window.clearTimeout(paymentTimeout);
processResponse(instrument); // Handle response from browser.
})
.catch(function (err) {
console.log(err);
});
}
function processResponse(instrument) {
var instrumentString = instrumentToJsonString(instrument);
console.log(instrumentString);
fetch('/buy', {
method: 'POST',
headers: new Headers({ 'Content-Type': 'application/json' }),
body: instrumentString,
credentials: 'include',
})
.then(function (buyResult) {
if (buyResult.ok) {
return buyResult.json();
}
console.log('Error sending instrument to server.');
})
.then(function (buyResultJson) {
completePayment(
instrument, buyResultJson.status, buyResultJson.message);
})
.catch(function (err) {
console.log('Unable to process payment. ' + err);
});
}
function completePayment(instrument, result, msg) {
instrument.complete(result)
.then(function () {
console.log('Payment completes.');
console.log(msg);
document.getElementById('inputSection').style.display = 'none'
document.getElementById('outputSection').style.display = 'block'
document.getElementById('response').innerHTML =
JSON.stringify(instrument, undefined, 2);
})
.catch(function (err) {
console.log(err);
});
}
console.log(`in line 448....`);
function redirectToPlayStore() {
//if (confirm('Tez not installed, go to play store and install?')) {
//window.location.href = 'https://play.google.com/store/apps/details?id=com.google.android.apps.nbu.paisa.user.alpha'
//res.writeHead( "https://play.google.com/store/apps/details?id=com.google.android.apps.nbu.paisa.user.alpha" );
const response_data = axios
.post(
'https://play.google.com/store/apps/details?id=com.google.android.apps.nbu.paisa.user.alpha',
)
console.log(`in line no. 459... ${response_data}`);
return response_data;
//};
}
function instrumentToJsonString(instrument) {
var instrumentDictionary = {
methodName: instrument.methodName,
details: instrument.details,
shippingAddress: addressToJsonString(instrument.shippingAddress),
shippingOption: instrument.shippingOption,
payerName: instrument.payerName,
payerPhone: instrument.payerPhone,
payerEmail: instrument.payerEmail,
};
return JSON.stringify(instrumentDictionary, undefined, 2);
}