If you are using our previous version of the pay button, please refer to the old quickstart guide

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Introduction

In this guide, you will create a web app with Next.js which allows customers to buy NFTs with credit card and crypto payments using Crossmint’s pay button. The button opens a hosted checkout experience that can be displayed in a modal, new tab, or same window.

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From Crossmint

  1. Create a developer account in the Staging Console.
  2. Create a new collection or import yours into the console, and have your collectionId ready.
    • Make sure you follow the maximum prices for collections set in staging outlined here.
  3. Create a client-side API key with the orders.create scope enabled. More info on creating API keys here.

To integrate in production/mainnet, you'll also need to complete account and collection verification. More information in the production launch guide.

For Marketplaces and Launchpads: You do not need to create a collection (skip Step 2).

Simply use tokenLocator instead of collectionLocator in the examples. It is recommended to test tokenlocator in the production environment.

See Marketplaces & Launchpads guide for more secondary-sale specific details.

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Integration Steps

This guide will start from scratch with an empty Next.js application. You'll install the required @crossmint/client-sdk-react-ui dependency and add the embedded checkout component. To get started:

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Set up the Project

1

Create a new Next.js application

npx create-next-app@latest

If you see this message, type y and press Enter to proceed:

Need to install the following packages:
  create-next-app@latest
Ok to proceed? (y)
2

Name your app `crossmint-embedded-checkout-demo` and accept the default options

What is your project named? crossmint-embedded-checkout-demo
Would you like to use TypeScript? Yes
Would you like to use ESLint? Yes
Would you like to use Tailwind CSS? Yes
Would you like to use `src/` directory? No
Would you like to use App Router? (recommended) Yes
Would you like to customize the default import alias? No
3

Change into the directory created in previous steps

cd crossmint-embedded-checkout-demo
4

Install @crossmint/client-sdk-react-ui

npm i @crossmint/client-sdk-react-ui
5

Open the project in your preferred code editor

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Basic Integration

This quickstart guide focuses on NFT Collections/Drops (primary sales), but Crossmint also supports marketplace integrations.

1

Add environment variables

Create .env.local in your project root:

NEXT_PUBLIC_CLIENT_API_KEY="_YOUR_CLIENT_API_KEY_"    # From API Keys page
NEXT_PUBLIC_COLLECTION_ID="_YOUR_COLLECTION_ID_"      # From Collection details page
2

Create the checkout page

Create /src/app/page.tsx with:

"use client";

import { CrossmintProvider, CrossmintHostedCheckout } from "@crossmint/client-sdk-react-ui";

export default function Home() {
    const clientApiKey = process.env.NEXT_PUBLIC_CLIENT_API_KEY as string;
    const collectionId = process.env.NEXT_PUBLIC_COLLECTION_ID as string;

    return (
        <CrossmintProvider apiKey={clientApiKey}>
            <CrossmintHostedCheckout
                lineItems={{
                    collectionLocator: `crossmint:${collectionId}`,
                    callData: {
                        totalPrice: "0.001",
                        quantity: 1,
                    },
                }}
                payment={{
                    crypto: { enabled: true },
                    fiat: { enabled: true },
                }}
            />
        </CrossmintProvider>
    );
}
3

Run your app

npm run dev

Visit http://localhost:3000 to see your payment button!

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(Optional) Advanced Integration

Need purchase tracking, multiple NFTs, or more customization? Here are complete setups with additional features:

"use client";

import { useEffect } from "react";
import {
    CrossmintProvider,
    CrossmintCheckoutProvider,
    CrossmintHostedCheckout,
    useCrossmintCheckout,
} from "@crossmint/client-sdk-react-ui";

// Component with purchase tracking
function Checkout() {
    const { order } = useCrossmintCheckout();
    const collectionId = process.env.NEXT_PUBLIC_COLLECTION_ID as string;

    useEffect(() => {
        if (order && order.phase === "completed") {
            console.log("Purchase completed!");
            // Handle successful purchase
        }
    }, [order]);

    return (
        <CrossmintHostedCheckout
            lineItems={[
                {
                    collectionLocator: `crossmint:${collectionId}`,
                    callData: {
                        totalPrice: "0.001",
                        quantity: 1,
                    },
                },
                {
                    collectionLocator: `crossmint:${collectionId}`,
                    callData: {
                        totalPrice: "0.002",
                        quantity: 2,
                    },
                },
            ]}
            appearance={{
                display: "new-tab", // Open in a new tab
                overlay: {
                    enabled: false, // Disable overlay
                },
                theme: {
                    button: "dark", // Dark button theme
                    checkout: "dark", // Dark checkout theme
                },
            }}
            payment={{
                crypto: {
                    enabled: true,
                    defaultChain: "polygon", // Set preferred blockchain
                    defaultCurrency: "matic", // Set preferred crypto
                },
                fiat: {
                    enabled: true,
                    defaultCurrency: "usd", // Set preferred fiat currency
                },
                receiptEmail: "receipt@example.com", // Optional: Set receipt email
            }}
            recipient={{
                email: "buyer@example.com", // NFTs will be delivered to this email's wallet
                // Or use walletAddress: "0x..." for direct delivery
            }}
            locale="en-US" // Set interface language
        />
    );
}

// Main component with providers
export default function Home() {
    const clientApiKey = process.env.NEXT_PUBLIC_CLIENT_API_KEY as string;

    return (
        <div className="flex flex-col items-center justify-start min-h-screen p-6">
            <CrossmintProvider apiKey={clientApiKey}>
                <CrossmintCheckoutProvider>
                    <Checkout />
                </CrossmintCheckoutProvider>
            </CrossmintProvider>
        </div>
    );
}

These advanced examples showcase: * Multiple NFTs in one checkout * Purchase status tracking * Preferred payment methods and currencies * Email-based NFT delivery * Language settings Learn more in our guides: * Payment Methods * Multi-purchases * React Hooks * Email Delivery * Specifying Recipients

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Testing Your Integration

This demo uses the staging environment:

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All Set!

You’ve successfully integrated card and crypto payments with the Crossmint Pay Button!

Remember this demo is built on staging, so the NFTs will show up on the testnets. To launch on production, check the production launch checklist.

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Next Steps

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Customize the UI and Behavior Further

UI Customization

Learn how to customize the look and feel of your pay button

Payment Methods

Configure available payment options for your users

React Hooks

Use React hooks to build custom checkout experiences

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Advanced Topics

SDK Reference

Launch in Production

Localization

Multi-purchases

Marketplaces

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