pay.ts

import crypto from 'crypto';
import { v4 as uuidv4 } from 'uuid';
import axios from 'axios';

const SECRET_KEY = "";
const ACCESS_KEY = "";
const PROFILE_ID = "";

const sign = (data: string) => crypto.createHmac('sha256', SECRET_KEY).update(data).digest('base64');

// params is the payment form json data
// params.signed_field_names is a comma separated string
// eg 'access_key,profile_id,transaction_uuid,...'
const buildDataToSign = (params: any) => {
  const signedFieldNamesArray = params.signed_field_names.split(',');
  const dataToSign = [];
  for(const field of signedFieldNamesArray) {
    dataToSign.push(`${field}=${params[field]}`);
  }
  return dataToSign.join(',');
};

const makePayment = async (data: any) => {
  try {
    const response = await axios.post('https://testsecureacceptance.cybersource.com/pay', data);
    console.log(response.data);
  } catch(e) {
    console.error(e.response.data);
    throw e;
  }
  
}

const main = () => {
  const params = { 
    access_key: ACCESS_KEY, 
    profile_id: PROFILE_ID, 
    transaction_uuid: uuidv4(), 
    signed_field_names: 'access_key,profile_id,transaction_uuid,signed_field_names,unsigned_field_names,signed_date_time,locale,transaction_type,reference_number,amount,currency', 
    unsigned_field_names: 'card_type,card_number,card_expiry_date', 
    signed_date_time: new Date(), 
    locale: 'en', 
    transaction_type: 'authorization', 
    reference_number: new Date().getTime(), // Use UUIDV4 
    amount: 100, 
    currency: 'KES',

    card_type: '001',
    card_number: '4242424242424242',
    card_expiry_date: '11-2020',
    
    signature: ''
  };

  params.signature = sign(buildDataToSign(params));

  console.log(params);

  makePayment(params);
};

main();