import crypto from 'crypto';

// Encryption/Decryption functions (shared across all APIs)
function encryptMerchantData(data, key, iv) {
  if (typeof data === 'object') {
    data = JSON.stringify(data);
  }
  const cipher = crypto.createCipheriv('aes-256-cbc', key, iv);
  const encrypted = Buffer.concat([cipher.update(data, 'utf8'), cipher.final()]);
  return encrypted.toString('base64');
}

function decryptMerchantData(data, key, iv) {
  const decipher = crypto.createDecipheriv('aes-256-cbc', key, iv);
  const decrypted = Buffer.concat([
    decipher.update(Buffer.from(data, 'base64')),
    decipher.final()
  ]);
  return decrypted.toString('utf8');
}

// Your API credentials
const API_KEY = 'your_32_char_api_key_here_123456';
const SECRET_KEY = 'your_16_char_iv_12';

// Step 1: Generate access token
async function generateAccessToken() {
  const credentials = {
    apiKey: API_KEY,
    secretKey: SECRET_KEY
  };

  const encryptedPayload = encryptMerchantData(credentials, API_KEY, SECRET_KEY);

  const response = await fetch('https://merchant.paywize.in/v1/auth/clients/token', {
    method: 'POST',
    headers: { 'Content-Type': 'application/json' },
    body: JSON.stringify({ payload: encryptedPayload })
  });

  const result = await response.json();
  if (result.respCode === 2000) {
    const decryptedData = decryptMerchantData(result.data, API_KEY, SECRET_KEY);
    return JSON.parse(decryptedData).token;
  }
  throw new Error(result.respMessage);
}

// Step 2: Initiate payment collection
async function initiatePayment(token) {
  const paymentData = {
    senderId: "TXN123456",
    txnType: "INTENT",
    vpa: "merchant@paywize",
    channel: "FINO",
    requestAmount: "100.50",
    remarks: "Payment123",
    callbackUrl: "https://your-webhook-url.com/callback"
  };

  const encryptedPayload = encryptMerchantData(paymentData, API_KEY, SECRET_KEY);

  const response = await fetch('https://merchant.paywize.in/collection/v1/initiate/', {
    method: 'POST',
    headers: {
      'Content-Type': 'application/json',
      'Authorization': `Bearer ${token}`
    },
    body: JSON.stringify({ payload: encryptedPayload })
  });

  const result = await response.json();
  if (result.respCode === 2000) {
    const decryptedData = decryptMerchantData(result.data, API_KEY, SECRET_KEY);
    return JSON.parse(decryptedData);
  }
  throw new Error(result.respMessage);
}

// Step 3: Check payment status
async function checkPaymentStatus(token, txnId) {
  const response = await fetch(
    `https://merchant.paywize.in/collection/v1/status?txnId=${txnId}`,
    {
      headers: {
        'Content-Type': 'application/json',
        'Authorization': `Bearer ${token}`
      }
    }
  );

  const result = await response.json();
  if (result.respCode === 2000) {
    const decryptedData = decryptMerchantData(result.data, API_KEY, SECRET_KEY);
    return JSON.parse(decryptedData);
  }
  throw new Error(result.respMessage);
}

// Complete workflow
async function collectionWorkflow() {
  try {
    // Generate token
    const token = await generateAccessToken();
    console.log('✅ Token generated successfully');

    // Initiate payment
    const payment = await initiatePayment(token);
    console.log('✅ Payment initiated:', payment);
    console.log('Payment URL:', payment.paymentUrl);
    console.log('UPI Intent:', payment.intentUrl);

    // Check status
    const status = await checkPaymentStatus(token, payment.txnId);
    console.log('✅ Payment status:', status);

  } catch (error) {
    console.error('❌ Error:', error.message);
  }
}

// Run the workflow
collectionWorkflow();

npm install @paywize/collection-api

import { PaywizeCollection } from '@paywize/collection-api';

const client = new PaywizeCollection({
  apiKey: 'your_api_key',
  secretKey: 'your_secret_key',
  environment: 'production' // or 'sandbox'
});

const payment = await client.initiate({
  senderId: 'TXN123456',
  requestAmount: '100.50',
  vpa: 'merchant@paywize',
  channel: 'FINO'
});

pip install paywize-collection

from paywize_collection import PaywizeCollection

client = PaywizeCollection(
    api_key='your_api_key',
    secret_key='your_secret_key',
    environment='production'  # or 'sandbox'
)

payment = client.initiate({
    'senderId': 'TXN123456',
    'requestAmount': '100.50',
    'vpa': 'merchant@paywize',
    'channel': 'FINO'
})