I am trying to initiate subscription api in paytm payment gateway but it is showing invalid checksum. Someone pls help. These are the params that i am passing for subscription. Callback Response: [Object: null prototype] { ORDERID: 'TEST_1663489118608', MID: 'hgUOjr70796901152921', TXNAMOUNT: '233.00', CURRENCY: 'INR', STATUS: 'TXN_FAILURE', RESPCODE: '330', RESPMSG: 'Invalid checksum', BANKTXNID: '' } 18 Sep 13:48:40 - checksum not found Checksum Result => false
params['requestType'] = 'NATIVE_SUBSCRIPTION';
params['MID'] = config.PaytmConfig.mid;
params['WEBSITE'] = config.PaytmConfig.website;
params['ORDER_ID'] = 'TEST_' + new Date().getTime();
params['subscriptionAmountType'] = "FIX";
params['subscriptionFrequency']= "2";
params['subscriptionFrequencyUnit'] = "MONTH";
params['subscriptionExpiryDate'] = "2031-05-20";
params['subscriptionEnableRetry'] = "1";
params['CUST_ID'] = paymentDetails.customerId;
params['TXN_AMOUNT'] = paymentDetails.amount;
params['CALLBACK_URL'] = 'http://localhost:4000/callbackUrl';
params['EMAIL'] = paymentDetails.customerEmail;
params['MOBILE_NO'] = paymentDetails.customerPhone;
checksum_lib.genchecksum(params, config.PaytmConfig.key, function (err, checksum) {
var txn_url = "https://securegw-stage.paytm.in/theia/processTransaction"; // for staging
// var txn_url = "https://securegw.paytm.in/theia/processTransaction"; // for production
console.log("checksum value",checksum)
var form_fields = "";
for (var x in params) {
form_fields += "<input type='hidden' name='" + x + "' value='" + params[x] + "' >";
}
form_fields += "<input type='hidden' name='CHECKSUMHASH' value='" + checksum + "' >";
res.writeHead(200, { 'Content-Type': 'text/html' });
res.write('<html><head><title>Merchant Checkout Page</title></head><body><center><h1>Please do not refresh this page...</h1></center><form method="post" action="' + txn_url + '" name="f1">' + form_fields + '</form><script type="text/javascript">document.f1.submit();</script></body></html>');
res.end();
});