Question 246249 in Javascript Question posted in
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Cashfree signature is not validating in javascript

I am integrating cashfree gateway in our website which uses nodejs(koa server). To validate the signature they send request body and timestamp in headers so to validate it I have to generate signature at by concating timestamp with raw body ( amount field must contain 2 digits after decimal ).

I am facing issue in javascript because cashfree wants amount field in 2 decimal place even in whole number but javascript converts (1898.00 into 1898) basically it does not understand decimal numbers when I parse the number in float and use toFixed(2) so data type changes to string.
I want to pass payment_amount and order_amount in float number for a whole number also in javascript
Is it possible to do that please help me here

ideal object
{"data":{"order":{"order_id":"order_453912VQqDHqtQDCQdRfZj5Q1W4G3apB","order_amount":17500.00,"order_currency":"INR","order_tags":{"address":"Hello World","localTransactionId":"2290","paymentFor":"1849939000004509001","type":"invoice"}},"payment":{"cf_payment_id":2148739167,"payment_status":"SUCCESS","payment_amount":17500.00,"payment_currency":"INR","payment_message":"Transaction Successful","payment_time":"2023-09-15T17:19:10+05:30","bank_reference":"85511","auth_id":null,"payment_method":{"app":{"channel":null,"upi_id":null}},"payment_group":"wallet"},"customer_details":{"customer_name":null,"customer_id":"1849939000003987046","customer_email":"[email protected]","customer_phone":"+918909997453"}},"event_time":"2023-09-15T17:19:12+05:30","type":"PAYMENT_SUCCESS_WEBHOOK"}

what I my code is able to generate

1)without decimal places for whole number

{"data":{"order":{"order_id":"order_453912VQqDHqtQDCQdRfZj5Q1W4G3apB","order_amount":17500,"order_currency":"INR","order_tags":{"address":"Hello World","localTransactionId":"2290","paymentFor":"1849939000004509001","type":"invoice"}},"payment":{"cf_payment_id":2148739167,"payment_status":"SUCCESS","payment_amount":17500,"payment_currency":"INR","payment_message":"Transaction Successful","payment_time":"2023-09-15T17:19:10+05:30","bank_reference":"85511","auth_id":null,"payment_method":{"app":{"channel":null,"upi_id":null}},"payment_group":"wallet"},"customer_details":{"customer_name":null,"customer_id":"1849939000003987046","customer_email":"[email protected]","customer_phone":"+918909997453"}},"event_time":"2023-09-15T17:19:12+05:30","type":"PAYMENT_SUCCESS_WEBHOOK"}

  1. in string datatype

{"data":{"order":{"order_id":"order_453912VQqDHqtQDCQdRfZj5Q1W4G3apB","order_amount":"17500.00","order_currency":"INR","order_tags":{"address":"Hello World","localTransactionId":"2290","paymentFor":"1849939000004509001","type":"invoice"}},"payment":{"cf_payment_id":2148739167,"payment_status":"SUCCESS","payment_amount":"17500.00","payment_currency":"INR","payment_message":"Transaction Successful","payment_time":"2023-09-15T17:19:10+05:30","bank_reference":"85511","auth_id":null,"payment_method":{"app":{"channel":null,"upi_id":null}},"payment_group":"wallet"},"customer_details":{"customer_name":null,"customer_id":"1849939000003987046","customer_email":"[email protected]","customer_phone":"+918909997453"}},"event_time":"2023-09-15T17:19:12+05:30","type":"PAYMENT_SUCCESS_WEBHOOK"}

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2

Answers


  1. 0

    Your answer is :

    // Sample object
const inputData = {
    "data": {
        "order": {
            "order_id": "order_453912VQqDHqtQDCQdRfZj5Q1W4G3apB",
            "order_amount": 17500.00, // This should be converted to a float with 2 decimal places
            "order_currency": "INR",
            // ...
        },
        "payment": {
            "cf_payment_id": 2148739167,
            "payment_status": "SUCCESS",
            "payment_amount": 17500.00, // This should be converted to a float with 2 decimal places
            "payment_currency": "INR",
            // ...
        },
        // ...
    },
    // ...
};

// Convert order_amount and payment_amount to floats with 2 decimal places
inputData.data.order.order_amount = parseFloat(inputData.data.order.order_amount).toFixed(2);
inputData.data.payment.payment_amount = parseFloat(inputData.data.payment.payment_amount).toFixed(2);

console.log(inputData);
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  2. 0

    I don’t think you need to convert the object at all. Even before parsing the object, you should just grab the raw body and do the signature verification first.
    For webhook validations, you shouldn’t be parsing the body at all.

    see here: https://github.com/cashfree/cashfree-pg-webhook/blob/main/node/server.js

    Basically, we just copy the raw requestbody in another parameter and use that for signature verification.

    app.use(
  express.json({
    limit: '2mb',
    verify: (req, res, buf) => {
      req.rawBody = buf.toString();
    },
  })
);
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