gistfile1.js

// this example script uses a user-submitted script to modify image
// data from a canvas in which the user drew art

var sandbox   = new JSandbox(),
userArt       = document.getElementById("userArt").getContext("2d"),
imageData     = userArt.getImageData(0, 0, userArt.width, userArt.height);

sandbox.load("user-submitted-script.js", function () { // onload
	this.eval("doStuffWithImageData(input)", function (modifiedImageData) {
		userArt.putImageData(modifiedImageData, 0, 0);
		this.terminate();
		sandbox = null;
	}, imageData);
});

payment requests for bKash, Nagad, and Coinbase Commerce, enforces Bearer Token authentication, and handles real-time Webhook notifications. ### System Architecture Flow [Your Client/Device] ──(Secure API Call)──> [Your API Server] ──(Real-time SDK/API)──> [bKash/Nagad/Coinbase] │ [Your Database/App] <──(Real-time Webhook)── [Your API Server] <──(Callback Notification)────┘ --- ### 1. The Real-Time API Implementation (server.js) Make sure to install the required dependencies first: bash npm install express cors dotenv helmet body-parser axios Save the following code as server.js: ```javascript /** * Real-Time Payment & Payout Gateway API Wrapper * Supported Providers: bkash, nagad, rocket, coinbase * Authorization: Bearer Token * Language: Node.js (Express) */ require('dotenv').config(); const express = require('express'); const cors = require('cors'); const helmet = require('helmet'); const bodyParser = require('body-parser'); const app = express(); const PORT = process.env.PORT || 5000; // Security & Middleware configuration app.use(helmet()); // Secure HTTP headers app.use(cors()); // Enable Cross-Origin Resource Sharing app.use(bodyParser.json()); // Parse JSON payloads // Secure Master Token (Matches sandbox environment requirement) const MASTER_BEARER_TOKEN = process.env.MASTER_CODE || "SECURE-GATEWAY-TOKEN-2026"; // ========================================== // MIDDLEWARE: Authentication & Security // ========================================== const authenticateRequest = (req, res, next) => { const authHeader = req.headers['authorization']; if (!authHeader || !authHeader.startsWith('Bearer ')) { return res.status(401).json({ status: "ERROR", message: "Unauthorized: Missing or malformed Authorization header." }); } const token = authHeader.split(' ')[1]; if (token !== MASTER_BEARER_TOKEN) { return res.status(403).json({ status: "ERROR", message: "Forbidden: Invalid Bearer Token." }); } next(); }; // ========================================== // ENDPOINT 1: Initiate Real-Time Payment / Payout // POST /api/v1/pay // ========================================== app.post('/api/v1/pay', authenticateRequest, async (req, res) => { const { provider, amount, currency, receiver_wallet, reference } = req.body; // 1. Input Validation if (!provider || !amount || !currency || !receiver_wallet) { return res.status(400).json({ status: "FAILED", message: "Missing required parameters: provider, amount, currency, receiver_wallet" }); } const supportedProviders = ['bkash', 'nagad', 'rocket', 'coinbase']; if (!supportedProviders.includes(provider.toLowerCase())) { return res.status(400).json({ status: "FAILED", message: Unsupported provider. Supported: ${supportedProviders.join(', ')} }); } try { console.log(`[${new Date().toISOString()}] Initiating real-time transfer via ${provider.toUpperCase()}...`); // Generate dynamic transaction ID const transactionId = `TXN-${provider.toUpperCase()}-${Math.random().toString(36).substring(2, 8).toUpperCase()}`; // 2. Simulate MFS / Coinbase Gateway Handshake // In production, you would replace this block with the official API HTTP request of bKash/Nagad/Coinbase const gatewayResponse = { transaction_id: transactionId, provider: provider.toLowerCase(), amount: parseFloat(amount), currency: currency.toUpperCase(), receiver_wallet: receiver_wallet, reference: reference || `REF-${Math.floor(Math.random() * 9000) + 1000}`, status: "SUCCESSFUL", // Mock response status timestamp: new Date().toISOString() }; // 3. Return Instant Response to client return res.status(200).json({ status: "SUCCESS", message: `Payment/Transfer successfully processed via ${provider.toUpperCase()}`, data: gatewayResponse }); } catch (error) { console.error("Gateway Integration Error:", error.message); return res.status(500).json({ status: "ERROR", message: "Internal gateway timeout. Please retry.", error: error.message }); } }); // =======================