React

Overview

The Moment React SDK enables seamless payment integration into any React application. Whether you need a modal overlay or an inline embedded checkout, the SDK provides a simple, declarative API with React hooks to handle the entire payment flow. Built with React and modern hooks, the SDK integrates naturally with your React workflow and state management.

Key Features

React Hooks API – Declarative interface with useCheckout hook
Flexible Display Options – Modal or inline embedded checkout
TypeScript Support – Full type definitions included
Flexible Callbacks – Handle success, failure, cancellation, and retry events
Cross-Origin Safe – Secure iframe communication via postMessage
Environment Detection – Automatic sandbox / production switching
PCI Compliant – Sensitive payment data handled entirely in Moment’s secure iframe

Display Variants

Variant	Availability	Description
`modal`	Available	Opens checkout in a centered modal overlay (default)
`inline`	Coming Soon	Renders checkout inside a specified container element

How It Works

Page loads — MomentProvider mounts (SDK init), then MomentCheckoutProvider mounts, registering your fetchClientToken, fetchSessionStatus, and event callbacks (onSuccess, onFailure, etc.)
Customer clicks Pay — checkout.launch() is called from your component
SDK calls fetchClientToken — your callback creates a session on your backend (with a success_url) and returns the client_token
Checkout opens in your chosen variant (modal or inline)
Customer submits payment — Moment takes over the full page and redirects to the authentication page
Customer completes authentication on the external page
Customer is redirected back to your success_url with ?session_id=abc123 appended
Page loads again — MomentCheckoutProvider detects the session_id in the URL automatically and calls your fetchSessionStatus('abc123') callback
Your callback fetches the status from your backend, which queries Moment API
SDK routes to the right handler — onSuccess, onFailure, onExpired, or onCancel — and removes session_id from the URL silently
Webhooks are delivered to your backend regardless of outcome

Installation

NPM

npm install momentpay

Yarn

yarn add momentpay

pnpm

pnpm add momentpay

Quick Start

1. Initialize the SDK

Set up two providers at the root of your app: MomentProvider initializes the SDK instance (equivalent to Moment(clientKey) in vanilla JS), and MomentCheckoutProvider configures the checkout product (equivalent to moment.checkout(config)). You provide two fetch callbacks — the SDK calls them automatically at the right moments, so you never manage tokens or session IDs manually. Backend endpoints:

server.js

// Called by fetchClientToken when checkout.launch() is triggered
app.post('/api/create-payment-session', async (req, res) => {
  const response = await fetch('https://api.momentpay.net/collect/payment_sessions', {
    method: 'POST',
    headers: {
      'Authorization': 'Bearer sk_test_your_secret_key',
      'Content-Type': 'application/json',
    },
    body: JSON.stringify({
      amount: 10000, // Amount in cents (e.g., R100.00)
      currency: 'ZAR',
      type: 'one_time',
      options: {
        checkout_options: {
          presentation_mode: { mode: 'embedded' },
          success_url: 'https://yoursite.com/checkout?session_id={SESSION_ID}', // required for redirect payments
        },
      },
    }),
  });
  const { client_token } = await response.json();
  res.json({ client_token });
});

// Called by fetchSessionStatus after customer returns from a redirect payment.
// The SDK extracts session_id from the URL (?session_id=abc123) and passes it here.
app.get('/api/session-status', async (req, res) => {
  const sessionId = req.query.session_id;
  const response = await fetch(
    `https://api.momentpay.net/collect/payment_sessions/${sessionId}`,
    { headers: { 'Authorization': 'Bearer sk_test_your_secret_key' } }
  );
  const session = await response.json();
  res.json({ status: session.status, ...session });
});

server.py

import requests
from flask import Flask, request, jsonify

app = Flask(__name__)
SECRET_KEY = 'sk_test_your_secret_key'

# Called by fetchClientToken when checkout.launch() is triggered
@app.route('/api/create-payment-session', methods=['POST'])
def create_payment_session():
    response = requests.post(
        'https://api.momentpay.net/collect/payment_sessions',
        headers={
            'Authorization': f'Bearer {SECRET_KEY}',
            'Content-Type': 'application/json',
        },
        json={
            'amount': 10000,  # Amount in cents (e.g., R100.00)
            'currency': 'ZAR',
            'type': 'one_time',
            'options': {
                'checkout_options': {
                    'presentation_mode': {'mode': 'embedded'},
                    'success_url': 'https://yoursite.com/checkout?session_id={SESSION_ID}',  # required for redirect payments
                },
            },
        },
    )
    data = response.json()
    return jsonify({'client_token': data['client_token']})

# Called by fetchSessionStatus after customer returns from a redirect payment.
# The SDK extracts session_id from the URL (?session_id=abc123) and passes it here.
@app.route('/api/session-status', methods=['GET'])
def get_session_status():
    session_id = request.args.get('session_id')
    response = requests.get(
        f'https://api.momentpay.net/collect/payment_sessions/{session_id}',
        headers={'Authorization': f'Bearer {SECRET_KEY}'},
    )
    session = response.json()
    return jsonify({'status': session['status'], **session})

server.go

package main

import (
    "bytes"
    "encoding/json"
    "fmt"
    "io"
    "net/http"
)

const secretKey = "sk_test_your_secret_key"
const momentAPI = "https://api.momentpay.net"

// Called by fetchClientToken when checkout.launch() is triggered
func createPaymentSession(w http.ResponseWriter, r *http.Request) {
    payload, _ := json.Marshal(map[string]any{
        "amount":   10000, // Amount in cents (e.g., R100.00)
        "currency": "ZAR",
        "type":     "one_time",
        "options": map[string]any{
            "checkout_options": map[string]any{
                "presentation_mode": map[string]string{"mode": "embedded"},
                "success_url":       "https://yoursite.com/checkout?session_id={SESSION_ID}", // required for redirect payments
            },
        },
    })

    req, _ := http.NewRequest("POST", momentAPI+"/collect/payment_sessions", bytes.NewBuffer(payload))
    req.Header.Set("Authorization", "Bearer "+secretKey)
    req.Header.Set("Content-Type", "application/json")

    resp, _ := http.DefaultClient.Do(req)
    defer resp.Body.Close()

    var result map[string]any
    json.NewDecoder(resp.Body).Decode(&result)

    w.Header().Set("Content-Type", "application/json")
    json.NewEncoder(w).Encode(map[string]any{"client_token": result["client_token"]})
}

// Called by fetchSessionStatus after customer returns from a redirect payment.
// The SDK extracts session_id from the URL (?session_id=abc123) and passes it here.
func getSessionStatus(w http.ResponseWriter, r *http.Request) {
    sessionID := r.URL.Query().Get("session_id")

    req, _ := http.NewRequest("GET", fmt.Sprintf("%s/collect/payment_sessions/%s", momentAPI, sessionID), nil)
    req.Header.Set("Authorization", "Bearer "+secretKey)

    resp, _ := http.DefaultClient.Do(req)
    defer resp.Body.Close()

    body, _ := io.ReadAll(resp.Body)
    w.Header().Set("Content-Type", "application/json")
    w.Write(body)
}

func main() {
    http.HandleFunc("/api/create-payment-session", createPaymentSession)
    http.HandleFunc("/api/session-status", getSessionStatus)
    http.ListenAndServe(":8080", nil)
}

functions/index.js

const { onCall } = require('firebase-functions/v2/https');
const axios = require('axios');

// Called by fetchClientToken — creates a payment session
exports.createPaymentSession = onCall(async (request) => {
  const { amount, currency } = request.data;
  const { data } = await axios.post(
    'https://api.momentpay.net/collect/payment_sessions',
    {
      amount,
      currency,
      type: 'one_time',
      options: {
        checkout_options: {
          presentation_mode: { mode: 'embedded' },
          success_url: 'https://yoursite.com/checkout?session_id={SESSION_ID}',
        },
      },
    },
    {
      headers: {
        Authorization: `Bearer ${process.env.MOMENT_SECRET_KEY}`,
        'Content-Type': 'application/json',
      },
    }
  );
  return { client_token: data.client_token };
});

// Called by fetchSessionStatus — retrieves session status after redirect
exports.getSessionStatus = onCall(async (request) => {
  const { sessionId } = request.data;
  const { data } = await axios.get(
    `https://api.momentpay.net/collect/payment_sessions/${sessionId}`,
    { headers: { Authorization: `Bearer ${process.env.MOMENT_SECRET_KEY}` } }
  );
  return { status: data.status, ...data };
});

supabase/functions/create-payment-session/index.ts

import { serve } from 'https://deno.land/std/http/server.ts';

// Invoked by fetchClientToken
serve(async () => {
  const response = await fetch('https://api.momentpay.net/collect/payment_sessions', {
    method: 'POST',
    headers: {
      Authorization: `Bearer ${Deno.env.get('MOMENT_SECRET_KEY')}`,
      'Content-Type': 'application/json',
    },
    body: JSON.stringify({
      amount: 10000,
      currency: 'ZAR',
      type: 'one_time',
      options: {
        checkout_options: {
          presentation_mode: { mode: 'embedded' },
          success_url: 'https://yoursite.com/checkout?session_id={SESSION_ID}',
        },
      },
    }),
  });
  const { client_token } = await response.json();
  return new Response(JSON.stringify({ client_token }), {
    headers: { 'Content-Type': 'application/json' },
  });
});

supabase/functions/get-session-status/index.ts

import { serve } from 'https://deno.land/std/http/server.ts';

// Invoked by fetchSessionStatus
serve(async (req) => {
  const { session_id } = await req.json();
  const response = await fetch(
    `https://api.momentpay.net/collect/payment_sessions/${session_id}`,
    { headers: { Authorization: `Bearer ${Deno.env.get('MOMENT_SECRET_KEY')}` } }
  );
  const session = await response.json();
  return new Response(JSON.stringify({ status: session.status, ...session }), {
    headers: { 'Content-Type': 'application/json' },
  });
});

handler.js

// Called by fetchClientToken — POST /api/create-payment-session
exports.createPaymentSession = async (event) => {
  const response = await fetch('https://api.momentpay.net/collect/payment_sessions', {
    method: 'POST',
    headers: {
      Authorization: `Bearer ${process.env.MOMENT_SECRET_KEY}`,
      'Content-Type': 'application/json',
    },
    body: JSON.stringify({
      amount: 10000,
      currency: 'ZAR',
      type: 'one_time',
      options: {
        checkout_options: {
          presentation_mode: { mode: 'embedded' },
          success_url: 'https://yoursite.com/checkout?session_id={SESSION_ID}',
        },
      },
    }),
  });
  const { client_token } = await response.json();
  return {
    statusCode: 200,
    headers: { 'Content-Type': 'application/json' },
    body: JSON.stringify({ client_token }),
  };
};

// Called by fetchSessionStatus — GET /api/session-status?session_id=abc123
exports.getSessionStatus = async (event) => {
  const sessionId = event.queryStringParameters?.session_id;
  const response = await fetch(
    `https://api.momentpay.net/collect/payment_sessions/${sessionId}`,
    { headers: { Authorization: `Bearer ${process.env.MOMENT_SECRET_KEY}` } }
  );
  const session = await response.json();
  return {
    statusCode: 200,
    headers: { 'Content-Type': 'application/json' },
    body: JSON.stringify({ status: session.status, ...session }),
  };
};

Frontend — wrap your app with MomentProvider + MomentCheckoutProvider:

Fetch (Native)
Axios
Firebase
Supabase
Lambda

App.jsx

import { MomentProvider, MomentCheckoutProvider } from 'momentpay';

function App() {
  return (
    <MomentProvider clientKey="pk_your_key_here">
      <MomentCheckoutProvider
        // SDK calls this when checkout.launch() is invoked to get a fresh session token
        fetchClientToken={async () => {
          const response = await fetch('/api/create-payment-session', { method: 'POST' });
          const data = await response.json();
          return data.client_token;
        }}

        // SDK calls this automatically when ?session_id=... is detected in the URL.
        // Happens after a customer returns from a redirect-based payment (3DS, bank redirect, EFT).
        // Must return: { status: 'completed' | 'failed' | 'expired' | 'cancelled', ... }
        fetchSessionStatus={async (sessionId) => {
          const response = await fetch('/api/session-status?session_id=' + sessionId);
          return response.json();
        }}

        onSuccess={(result) => {
          console.log('Payment successful!', result);
          // Redirect to success page or update UI
        }}
        onFailure={(result) => {
          console.log('Payment failed', result);
          // Show error message
        }}
        onCancel={(result) => {
          console.log('Payment cancelled', result);
          // Allow user to retry
        }}
        onAttemptFailed={(result) => {
          console.log('Payment attempt failed', result);
          // User can retry within the checkout
        }}
        onExpired={(result) => {
          console.log('Payment session expired', result);
          // Request a new session and retry
        }}
      >
        <YourApp />
      </MomentCheckoutProvider>
    </MomentProvider>
  );
}

export default App;

App.jsx

import { MomentProvider, MomentCheckoutProvider } from 'momentpay';
import axios from 'axios';

function App() {
  return (
    <MomentProvider clientKey="pk_your_key_here">
      <MomentCheckoutProvider
        // SDK calls this when checkout.launch() is invoked to get a fresh session token
        fetchClientToken={async () => {
          const { data } = await axios.post('/api/create-payment-session');
          return data.client_token;
        }}

        // SDK calls this automatically when ?session_id=... is detected in the URL.
        // Happens after a customer returns from a redirect-based payment (3DS, bank redirect, EFT).
        // Must return: { status: 'completed' | 'failed' | 'expired' | 'cancelled', ... }
        fetchSessionStatus={async (sessionId) => {
          const { data } = await axios.get('/api/session-status', {
            params: { session_id: sessionId },
          });
          return data;
        }}

        onSuccess={(result) => {
          console.log('Payment successful!', result);
          // Redirect to success page or update UI
        }}
        onFailure={(result) => {
          console.log('Payment failed', result);
          // Show error message
        }}
        onCancel={(result) => {
          console.log('Payment cancelled', result);
          // Allow user to retry
        }}
        onAttemptFailed={(result) => {
          console.log('Payment attempt failed', result);
          // User can retry within the checkout
        }}
        onExpired={(result) => {
          console.log('Payment session expired', result);
          // Request a new session and retry
        }}
      >
        <YourApp />
      </MomentCheckoutProvider>
    </MomentProvider>
  );
}

export default App;

App.jsx

import { MomentProvider, MomentCheckoutProvider } from 'momentpay';
import { getFunctions, httpsCallable } from 'firebase/functions';

const functions = getFunctions();
const createPaymentSession = httpsCallable(functions, 'createPaymentSession');
const getSessionStatus = httpsCallable(functions, 'getSessionStatus');

function App() {
  return (
    <MomentProvider clientKey="pk_your_key_here">
      <MomentCheckoutProvider
        // SDK calls this when checkout.launch() is invoked to get a fresh session token
        fetchClientToken={async () => {
          const { data } = await createPaymentSession({ amount: 10000, currency: 'ZAR' });
          return data.client_token;
        }}

        // SDK calls this automatically when ?session_id=... is detected in the URL.
        // Happens after a customer returns from a redirect-based payment (3DS, bank redirect, EFT).
        // Must return: { status: 'completed' | 'failed' | 'expired' | 'cancelled', ... }
        fetchSessionStatus={async (sessionId) => {
          const { data } = await getSessionStatus({ sessionId });
          return data;
        }}

        onSuccess={(result) => {
          console.log('Payment successful!', result);
          // Redirect to success page or update UI
        }}
        onFailure={(result) => {
          console.log('Payment failed', result);
          // Show error message
        }}
        onCancel={(result) => {
          console.log('Payment cancelled', result);
          // Allow user to retry
        }}
        onAttemptFailed={(result) => {
          console.log('Payment attempt failed', result);
          // User can retry within the checkout
        }}
        onExpired={(result) => {
          console.log('Payment session expired', result);
          // Request a new session and retry
        }}
      >
        <YourApp />
      </MomentCheckoutProvider>
    </MomentProvider>
  );
}

export default App;

App.jsx

import { MomentProvider, MomentCheckoutProvider } from 'momentpay';
import { createClient } from '@supabase/supabase-js';

const supabase = createClient('https://your-project.supabase.co', 'your-anon-key');

function App() {
  return (
    <MomentProvider clientKey="pk_your_key_here">
      <MomentCheckoutProvider
        // SDK calls this when checkout.launch() is invoked to get a fresh session token.
        // Invokes a Supabase Edge Function named 'create-payment-session'.
        fetchClientToken={async () => {
          const { data, error } = await supabase.functions.invoke('create-payment-session');
          if (error) throw error;
          return data.client_token;
        }}

        // SDK calls this automatically when ?session_id=... is detected in the URL.
        // Happens after a customer returns from a redirect-based payment (3DS, bank redirect, EFT).
        // Must return: { status: 'completed' | 'failed' | 'expired' | 'cancelled', ... }
        fetchSessionStatus={async (sessionId) => {
          const { data, error } = await supabase.functions.invoke('get-session-status', {
            body: { session_id: sessionId },
          });
          if (error) throw error;
          return data;
        }}

        onSuccess={(result) => {
          console.log('Payment successful!', result);
          // Redirect to success page or update UI
        }}
        onFailure={(result) => {
          console.log('Payment failed', result);
          // Show error message
        }}
        onCancel={(result) => {
          console.log('Payment cancelled', result);
          // Allow user to retry
        }}
        onAttemptFailed={(result) => {
          console.log('Payment attempt failed', result);
          // User can retry within the checkout
        }}
        onExpired={(result) => {
          console.log('Payment session expired', result);
          // Request a new session and retry
        }}
      >
        <YourApp />
      </MomentCheckoutProvider>
    </MomentProvider>
  );
}

export default App;

App.jsx

import { MomentProvider, MomentCheckoutProvider } from 'momentpay';

const API_BASE = 'https://your-api-id.execute-api.us-east-1.amazonaws.com/prod';

function App() {
  return (
    <MomentProvider clientKey="pk_your_key_here">
      <MomentCheckoutProvider
        // SDK calls this when checkout.launch() is invoked to get a fresh session token.
        // Calls your Lambda function via API Gateway.
        fetchClientToken={async () => {
          const response = await fetch(`${API_BASE}/create-payment-session`, {
            method: 'POST',
            headers: { 'Content-Type': 'application/json' },
          });
          const data = await response.json();
          return data.client_token;
        }}

        // SDK calls this automatically when ?session_id=... is detected in the URL.
        // Happens after a customer returns from a redirect-based payment (3DS, bank redirect, EFT).
        // Must return: { status: 'completed' | 'failed' | 'expired' | 'cancelled', ... }
        fetchSessionStatus={async (sessionId) => {
          const response = await fetch(
            `${API_BASE}/session-status?session_id=${sessionId}`
          );
          return response.json();
        }}

        onSuccess={(result) => {
          console.log('Payment successful!', result);
          // Redirect to success page or update UI
        }}
        onFailure={(result) => {
          console.log('Payment failed', result);
          // Show error message
        }}
        onCancel={(result) => {
          console.log('Payment cancelled', result);
          // Allow user to retry
        }}
        onAttemptFailed={(result) => {
          console.log('Payment attempt failed', result);
          // User can retry within the checkout
        }}
        onExpired={(result) => {
          console.log('Payment session expired', result);
          // Request a new session and retry
        }}
      >
        <YourApp />
      </MomentCheckoutProvider>
    </MomentProvider>
  );
}

export default App;

2. Open Checkout

Add useCheckout to any component and call checkout.launch() to trigger checkout:

Checkout.jsx

import { useCheckout } from 'momentpay';

function CheckoutButton() {
  const checkout = useCheckout({
    onSuccess: (result) => {
      console.log('Payment successful!', result);
      // Redirect to success page or update UI
    },
    onFailure: (result) => {
      console.log('Payment failed', result);
      // Show error message
    },
    onCancel: (result) => {
      console.log('Payment cancelled', result);
      // Allow user to retry
    },
    onAttemptFailed: (result) => {
      console.log('Payment attempt failed', result);
      // User can retry within the checkout
    },
  });

  return (
    <button onClick={() => checkout.launch()}>
      Pay Now
    </button>
  );
}

export default CheckoutButton;

API Reference

MomentProvider (SDK level)

Initializes the Moment SDK instance — equivalent to Moment(clientKey) in vanilla JS. Provides the SDK context to all product providers nested below it. Must be the outermost Moment wrapper in your app.

Prop	Type	Required	Description
`clientKey`	`string`	Yes	Your publishable key (`pk_test_...` or `pk_live_...`). Determines sandbox vs. production environment.

Example:

<MomentProvider clientKey="pk_test_abc123">
  <MomentCheckoutProvider ...>
    <App />
  </MomentCheckoutProvider>
</MomentProvider>

MomentCheckoutProvider (checkout product)

Initializes the checkout product — equivalent to moment.checkout(config) in vanilla JS. Must be a child of MomentProvider and a parent of any component using useCheckout.

Prop	Type	Required	Description
`fetchClientToken`	`function`	Yes	Async function returning `Promise<string>` — a fresh client token. Called by the SDK when `checkout.launch()` is invoked.
`fetchSessionStatus`	`function`	No	Async function receiving a `sessionId` string, returning `Promise<{ status: string, ... }>`. Called when a `session_id` is found in the URL after a redirect-based payment. Required only if you use redirect mode.
`onSuccess`	`function`	No	Global callback fired when payment succeeds (both embedded and redirect flows)
`onFailure`	`function`	No	Global callback fired when payment fails
`onCancel`	`function`	No	Global callback fired when user cancels
`onAttemptFailed`	`function`	No	Global callback fired when a payment attempt fails (user can retry)
`onExpired`	`function`	No	Global callback fired when the payment session expires

Example:

<MomentProvider clientKey="pk_test_abc123">
  <MomentCheckoutProvider
    fetchClientToken={async () => {
      const res = await fetch('/api/create-payment-session', { method: 'POST' });
      const data = await res.json();
      return data.client_token;
    }}
    // Only needed if using redirect mode
    fetchSessionStatus={async (sessionId) => {
      const res = await fetch('/api/session-status?session_id=' + sessionId);
      return res.json();
      // Must return: { status: 'completed' | 'failed' | 'expired' | 'cancelled', ... }
    }}
    onSuccess={(result) => console.log('Success:', result)}
    onFailure={(result) => console.log('Failed:', result)}
    onCancel={(result) => console.log('Cancelled:', result)}
    onAttemptFailed={(result) => console.log('Attempt failed:', result)}
    onExpired={(result) => console.log('Expired:', result)}
  >
    <App />
  </MomentCheckoutProvider>
</MomentProvider>

useCheckout(config)

React hook that returns a checkout object for triggering checkout from any component. Must be used inside MomentCheckoutProvider. Callbacks defined here are component-level and fire alongside any global callbacks on MomentCheckoutProvider.

Parameter	Type	Required	Description
`onSuccess`	`function`	No	Component-level callback fired when payment succeeds
`onFailure`	`function`	No	Component-level callback fired when payment fails
`onCancel`	`function`	No	Component-level callback fired when user cancels
`onAttemptFailed`	`function`	No	Component-level callback fired when a payment attempt fails (user can retry)
`onExpired`	`function`	No	Component-level callback fired when the payment session expires

Returns a checkout object — checkout.launch(), checkout.close(), and checkout.submit().

checkout.launch(options)

Opens the payment checkout. Internally calls fetchClientToken from MomentCheckoutProvider to retrieve a fresh token, then opens checkout. The display variant (modal or inline) is determined from the JWT payload variant claim, which is set when creating the session on your backend.

Parameter	Type	Required	Description
`options.container`	`string` or `Element`	No	CSS selector or DOM element — for inline variant only

Returns a Promise that resolves with { checkoutUrl, variant } once the checkout is open. Examples:

// Open checkout — SDK fetches token via fetchClientToken from MomentCheckoutProvider
checkout.launch();

// Inline checkout with custom container
checkout.launch({ container: '#checkout-container' });

checkout.close()

Manually closes the modal or inline checkout.

checkout.close();

checkout.submit() `Coming soon`

Triggers payment submission from outside the checkout UI — useful when you want an external “Pay” button rather than relying on the checkout’s built-in submit. Only available for the inline variant.

// Wire up an external Pay button
<button onClick={() => checkout.submit()}>Pay</button>

Callback Strategies

The Moment React SDK offers flexible callback handling at both the global (MomentCheckoutProvider) and component (useCheckout hook) levels. Understanding when to use each approach helps you write cleaner, more maintainable code.

Global Callbacks (MomentCheckoutProvider Level)

Define callbacks once at the MomentCheckoutProvider level to apply consistent behavior across your entire application. ✅ Best for:

App-wide analytics tracking
Global error logging
Consistent redirect patterns
Shared notification systems

App.jsx

import { MomentProvider, MomentCheckoutProvider } from 'momentpay';
import { useRouter } from 'next/router';
import { trackEvent } from './analytics';
import { showNotification } from './notifications';

function App() {
  const router = useRouter();

  return (
    <MomentProvider clientKey="pk_your_key_here">
      <MomentCheckoutProvider
        fetchClientToken={async () => {
          const res = await fetch('/api/create-payment-session', { method: 'POST' });
          const data = await res.json();
          return data.client_token;
        }}
        onSuccess={(result) => {
          // Global success behavior
          trackEvent('payment_success', { transaction_id: result.transaction_id });
          showNotification('Payment successful!', 'success');
          router.push('/success');
        }}
        onFailure={(result) => {
          // Global failure behavior
          trackEvent('payment_failure', { error: result.error });
          showNotification('Payment failed. Please try again.', 'error');
        }}
        onCancel={() => {
          trackEvent('payment_cancelled');
        }}
      >
        <YourApp />
      </MomentCheckoutProvider>
    </MomentProvider>
  );
}

Component-Level Callbacks (useCheckout Hook)

Override or supplement global callbacks with component-specific behavior. ✅ Best for:

Component-specific state updates
Different flows for different payment contexts
Local UI feedback
Context-aware error handling

ProductCheckout.jsx

function ProductCheckout({ product }) {
  const [status, setStatus] = useState('idle');

  const checkout = useCheckout({
    onSuccess: (result) => {
      // Component-specific behavior
      setStatus('success');
      // This will ALSO trigger the global onSuccess from MomentCheckoutProvider
    },
    onFailure: (result) => {
      setStatus('error');
      // This will ALSO trigger the global onFailure from MomentCheckoutProvider
    }
  });

  // ... rest of component
}

Callback Precedence

Important: Component-level callbacks do not override global callbacks. Both will fire:

Component-level callback fires first (if defined)
Global callback fires second (if defined)

This allows you to handle both component-specific and app-wide logic.

// Global callback (in MomentCheckoutProvider)
onSuccess: (result) => {
  console.log('Global: Tracking analytics');
  trackEvent('payment_success', result);
}

// Component callback (in useCheckout)
onSuccess: (result) => {
  console.log('Component: Updating local state');
  setPaymentComplete(true);
}

// Both will fire when payment succeeds:
// Output:
// "Component: Updating local state"
// "Global: Tracking analytics"

Example: Multi-Level Callback Architecture

App.jsx

import { MomentProvider, MomentCheckoutProvider } from 'momentpay';
import { analytics, errorTracking, notifications } from './services';

function App() {
  return (
    <MomentProvider clientKey={process.env.NEXT_PUBLIC_MOMENT_KEY}>
      <MomentCheckoutProvider
        fetchClientToken={async () => {
          const res = await fetch('/api/create-payment-session', { method: 'POST' });
          const data = await res.json();
          return data.client_token;
        }}
        // Global: Cross-cutting concerns
        onSuccess={(result) => {
          analytics.track('payment_completed', {
            transaction_id: result.transaction_id,
            payment_method: result.payment_method
          });
        }}
        onFailure={(result) => {
          errorTracking.capture(result.error);
          notifications.error('Payment failed');
        }}
        onCancel={() => {
          analytics.track('payment_cancelled');
        }}
      >
        <AppContent />
      </MomentCheckoutProvider>
    </MomentProvider>
  );
}

SubscriptionPage.jsx

function SubscriptionPage() {
  const [subscriptionActive, setSubscriptionActive] = useState(false);
  const router = useRouter();

  // Component: Subscription-specific logic
  const checkout = useCheckout({
    onSuccess: (result) => {
      // Update subscription state
      setSubscriptionActive(true);
      // Navigate to dashboard
      router.push('/dashboard');
      // Show plan-specific message
      notifications.success(`Welcome to ${selectedPlan.name}!`);
    },
    onFailure: () => {
      // Show retry option
      setShowRetryModal(true);
    }
  });

  // ... rest of component
}

Advanced Usage

Custom Hook for Payment Logic

hooks/usePayment.ts

import { useState, useCallback } from 'react';
import { useCheckout } from 'momentpay';

export function usePayment() {
  const [loading, setLoading] = useState(false);
  const [error, setError] = useState<string | null>(null);
  const [success, setSuccess] = useState(false);

  const checkout = useCheckout({
    onSuccess: () => {
      setSuccess(true);
      setLoading(false);
      setError(null);
    },
    onFailure: (result) => {
      setError(result.error?.message || 'Payment failed');
      setLoading(false);
    },
    onCancel: () => {
      setLoading(false);
      setError(null);
    }
  });

  const processPayment = useCallback(async () => {
    setLoading(true);
    setError(null);
    setSuccess(false);

    try {
      // SDK calls fetchClientToken from MomentCheckoutProvider automatically
      await checkout.launch();
    } catch (err) {
      setError(err instanceof Error ? err.message : 'Unknown error');
      setLoading(false);
    }
  }, [checkout]);

  return { processPayment, loading, error, success };
}

Using the Custom Hook

ProductCheckout.tsx

import { usePayment } from './hooks/usePayment';

function ProductCheckout({ product }) {
  const { processPayment, loading, error, success } = usePayment();

  if (success) {
    return <div className="success">Purchase successful!</div>;
  }

  return (
    <div>
      <h2>{product.name}</h2>
      <p>R{product.price.toFixed(2)}</p>

      {error && <div className="error">{error}</div>}

      <button onClick={processPayment} disabled={loading}>
        {loading ? 'Processing...' : 'Buy Now'}
      </button>
    </div>
  );
}

Security Best Practices

Never expose your secret key (sk_...) in frontend code
Always create sessions server-side using your secret key
Validate webhooks to confirm payment status server-side
Use HTTPS for all pages that include the SDK
Handle token expiry by requesting a new token if needed

Next Steps

View Sample Applications for end-to-end examples
Create your first Payment Session
Configure Webhooks
Test your integration in Sandbox mode

SDKs

Web

Mobile

Overview

Key Features

Display Variants

How It Works

Installation

NPM

Yarn

pnpm

Quick Start

1. Initialize the SDK

2. Open Checkout

API Reference

MomentProvider (SDK level)

MomentCheckoutProvider (checkout product)

useCheckout(config)

checkout.launch(options)

checkout.close()

checkout.submit() `Coming soon`

Callback Strategies

Global Callbacks (MomentCheckoutProvider Level)

Component-Level Callbacks (useCheckout Hook)

Callback Precedence

Example: Multi-Level Callback Architecture

Advanced Usage

Custom Hook for Payment Logic

Using the Custom Hook

Security Best Practices

Next Steps

SDKs

Web

Mobile

Documentation Index

​Overview

​Embedded Modal :

​Key Features

​Display Variants

​How It Works

​Installation

​NPM

​Yarn

​pnpm

​Quick Start

​1. Initialize the SDK

​2. Open Checkout

​API Reference

​MomentProvider (SDK level)

​MomentCheckoutProvider (checkout product)

​useCheckout(config)

​checkout.launch(options)

​checkout.close()

​checkout.submit() Coming soon

​Callback Strategies

​Global Callbacks (MomentCheckoutProvider Level)

​Component-Level Callbacks (useCheckout Hook)

​Callback Precedence

​Example: Multi-Level Callback Architecture

​Advanced Usage

​Custom Hook for Payment Logic

​Using the Custom Hook

​Security Best Practices

​Next Steps

Overview

Embedded Modal :

Key Features

Display Variants

How It Works

Installation

NPM

Yarn

pnpm

Quick Start

1. Initialize the SDK

2. Open Checkout

API Reference

MomentProvider (SDK level)

MomentCheckoutProvider (checkout product)

useCheckout(config)

checkout.launch(options)

checkout.close()

checkout.submit() `Coming soon`

Callback Strategies

Global Callbacks (MomentCheckoutProvider Level)

Component-Level Callbacks (useCheckout Hook)

Callback Precedence

Example: Multi-Level Callback Architecture

Advanced Usage

Custom Hook for Payment Logic

Using the Custom Hook

Security Best Practices

Next Steps