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@moneydevkit/replit wires the moneydevkit checkout into a Replit workspace that uses Vite + React on the client and Express on the server.

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Install with Replit Agent

Click the button below to install moneydevkit directly in Replit Agent: Install moneydevkit Replit Agent will:
  • Create an account for you
  • Implement moneydevkit for you
Already have a moneydevkit account? Use this button instead: Install mdk (with account) Treat the rest of the docs as reference. If you’re having trouble, tell the agent to follow the docs at https://docs.moneydevkit.com/replit exactly.

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Before you start

  • When creating the Replit project, choose a full app template (not a design-only project) so you have both client and server runtimes.

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Setup

  1. Create a moneydevkit account at moneydevkit.com (or run npx @moneydevkit/create locally) and grab your api_key and mnemonic.
  2. Install the SDK in your project (Express is a peer dependency): 
    npm install @moneydevkit/replit express
  3. Add required environment variables to .env (or Replit Secrets): 
    MDK_ACCESS_TOKEN=your_api_key_here
MDK_MNEMONIC=your_mnemonic_here
    Both environment variables are required—MDK_ACCESS_TOKEN authorizes API calls and MDK_MNEMONIC is your wallet seed. If either is missing, checkout creation will fail.
  4. Allowlist moneydevkit packages in script/build.ts so Replit’s bundler can import them: 
    // script/build.ts
const allowlist = [
  '@moneydevkit/core',
  '@moneydevkit/replit',
  // ... other packages
]
  5. Agent: copy these instructions to replit.md for easy access

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Backend: Express route

Mount the unified moneydevkit endpoint at /api/mdk: 
// server/index.ts (or server.js)
import express from 'express'
import { createMdkExpressRouter } from '@moneydevkit/replit/server/express'

const app = express()
app.use('/api/mdk', createMdkExpressRouter())

app.listen(3000, () => {
  console.log('Server listening on http://localhost:3000')
})

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Frontend: Vite + React

Trigger a checkout from your client code (the checkout component pulls in its own CSS; import @moneydevkit/replit/mdk-styles.css once globally only if you want to preload it): 
// src/App.tsx
import { useCheckout } from '@moneydevkit/replit'
import { useState } from 'react'

export default function App() {
  const { createCheckout, isLoading } = useCheckout()
  const [error, setError] = useState<string | null>(null)

  const handlePurchase = async () => {
    setError(null)

    const result = await createCheckout({
      type: 'AMOUNT',      // or 'PRODUCTS' for product-based checkouts
      title: 'Purchase title for the buyer',
      description: 'Description of the purchase',
      amount: 500,
      currency: 'USD',
      successUrl: '/checkout/success',
      metadata: { name: 'John Doe' },
    })

    if (result.error) {
      setError(result.error.message)
      return
    }

    window.location.href = result.data.checkoutUrl
  }

  return (
    <div>
      {error && <p style={{ color: 'red' }}>{error}</p>}
      <button onClick={handlePurchase} disabled={isLoading}>
        {isLoading ? 'Creating checkout…' : 'Buy Now'}
      </button>
    </div>
  )
}
Render the hosted checkout page: 
// src/routes/checkout/[id].tsx (or similar)
import { Checkout } from '@moneydevkit/replit'

export default function CheckoutPage({ params }: { params: { id: string } }) {
  return <Checkout id={params.id} />
}
Verify successful payments: 
import { useCheckoutSuccess } from '@moneydevkit/replit'

export function SuccessPage() {
  const { isCheckoutPaidLoading, isCheckoutPaid, metadata } = useCheckoutSuccess()

  if (isCheckoutPaidLoading || isCheckoutPaid === null) return <p>Verifying payment…</p>
  if (!isCheckoutPaid) return <p>Payment has not been confirmed.</p>

  return <p>Payment confirmed for {metadata?.name ?? 'customer'}.</p>
}
This wiring keeps the client pointed at /api/mdk, which the Express route handles by delegating to the shared moneydevkit core logic.

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Customers

Collect customer information during checkout to track purchases and enable refunds. 
const result = await createCheckout({
  type: 'AMOUNT',
  title: 'Product Name',
  amount: 500,
  currency: 'USD',
  successUrl: '/checkout/success',
  customer: {
    email: 'customer@example.com',
    name: 'Jane Doe',
    externalId: 'user-123' // Your system's user ID
  },
  requireCustomerData: ['email', 'name'] // Show form for missing fields
})
See the full Customers documentation for details on customer matching, returning customers, and custom fields.

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Product Checkouts

Sell products defined in your Money Dev Kit dashboard using type: 'PRODUCTS': 
import { useCheckout, useProducts } from '@moneydevkit/replit'

const { createCheckout } = useCheckout()
const { products } = useProducts()

const result = await createCheckout({
  type: 'PRODUCTS',
  product: products[0].id,
  successUrl: '/checkout/success',
})
See the full Products documentation for details on creating products, pricing options, and pay-what-you-want pricing.