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This example demonstrates how a merchant backend can accept intentMandate (SD-JWT-VC) tokens from an agent and process a payment via the Delegare SDK. The source code is available in the examples/express-checkout directory of the Delegare repository.

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Overview

  1. Setup Buyer: The merchant creates a setup session for the user.
  2. Authorization: The user completes the setup via the Delegare UI, generating an Intent Mandate.
  3. Checkout: The AI agent sends the Intent Mandate to the merchant’s /api/checkout endpoint.
  4. Execution: The merchant backend uses @delegare/sdk to charge the mandate.

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Merchant Backend (Node.js)

const { Delegare } = require('@delegare/sdk');
const express = require('express');

const delegare = new Delegare({
  merchantId: process.env.DELEGARE_MERCHANT_ID,
  apiKey: process.env.DELEGARE_API_KEY,
  baseUrl: 'https://api.sandbox.delegare.dev'
});

const app = express();
app.use(express.json());

app.post('/api/checkout', async (req, res) => {
  const { intentMandate, item } = req.body;

  try {
    // 1. Charge the agent!
    const receipt = await delegare.charge({
      intentMandate,
      amountCents: 1500, // $15.00
      currency: 'usd',
      description: `Order: ${item}`,
      idempotencyKey: `order_${Date.now()}`
    });

    res.json({ success: true, receipt });
  } catch (error) {
    res.status(402).json({ error: error.message });
  }
});

app.listen(4000);

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Running the Demo locally

If you have the Delegare repository cloned, you can run the interactive demo: 
cd examples/express-checkout
npm install
# Follow instructions in README to set your .env
npm start
Then, in a separate terminal, run the buyer setup script: 
node setup-buyer.js
This script will give you a setup URL. Open it, complete the flow in Sandbox mode, and the script will automatically output a curl command you can use to test the checkout!