Passkeys in E-Commerce: Passwordless Authentication

Passwords are a relic of the past – they get stolen, forgotten, and guessed. Passkeys solve this problem: Based on biometric authentication (fingerprint, facial recognition), passkey sign-ins on Microsoft accounts reach a 98% success rate (Microsoft) versus 32% with passwords, are phishing-resistant, and are eight times faster than a password with a second factor, according to Microsoft. For online shops, this means: fewer abandoned carts, more security, happier customers. Passkeys are a key component of a modern Zero Trust strategy.

What Are Passkeys?

Passkeys are a modern authentication method that replaces passwords with cryptographic key pairs. Instead of remembering a password, customers use their fingerprint, facial recognition, or a PIN on their device.

The technology is based on the open standards FIDO2 and WebAuthn, developed by the FIDO Alliance and W3C. Supported by Apple, Google, and Microsoft, passkeys are available on virtually all modern devices.

How Do Passkeys Work Technically?

Passkeys use asymmetric cryptography – the same principle as HTTPS encryption:

1. Registration: The device creates a key pair – a private and a public key
2. Storage: The private key stays secure on the device (in Secure Element), the public key goes to the shop
3. Login: The shop sends a challenge, the device signs it with the private key
4. Verification: The shop verifies the signature with the public key

Benefits for Online Shops

Switching to passkeys brings measurable benefits for e-commerce operators:

Security: Why Passkeys Prevent Phishing

Passkeys are phishing-resistant by design. This comes down to one clever mechanism:

Each passkey is bound to a specific domain (e.g., your-shop.example). Even if a user is lured to a fake site (e.g., your-sh0p.example), the passkey won't work there. The browser API automatically checks if the domain matches.

On fraud reduction, the available figures are mostly expectations: in the FIDO Alliance Passkey Index, 58% of the companies surveyed expect strong methods such as passkeys to reduce fraud.

Implementation in Online Shops

Integrating passkeys into your online shop is much easier today than a few years ago. What used to take six months can now be done in 2–3 sprints.

Options for Shop Systems

• Shopware: Passkey plugins available, or custom integration via WebAuthn API
• WooCommerce: WordPress plugins like MojoAuth offer no-code integration
• Custom shops: Direct WebAuthn API integration with JavaScript and PHP/Node.js backend

Basic Implementation Steps

1. Integrate the WebAuthn API: JavaScript code for browser communication
2. Adapt the backend: store public keys and generate challenges
3. Design the UI: place the passkey option prominently in the login area
4. Keep a fallback: password login as an alternative for older devices
5. Test: check compatibility across different devices and browsers

// Passkey registration (simplified example)
async function registerPasskey() {
  const options = await fetch('/api/passkey/register-options');
  
  const credential = await navigator.credentials.create({
    publicKey: await options.json()
  });
  
  await fetch('/api/passkey/register', {
    method: 'POST',
    body: JSON.stringify(credential)
  });
}

Hybrid Approach: Passkeys and Passwords in Parallel

A complete switch to passkeys is not needed right away. The recommended approach for online shops:

• Offer passkeys as an option – users can voluntarily switch
• Keep password login – for older devices and hesitant users
• Encourage gradual migration – invite to passkey registration after login
• OTP as bridge – optionally require one-time password before passkey registration

Browser and Device Compatibility

In 2026, passkeys are supported by practically every relevant platform:

Passkeys can be synced between devices (for example iPhone to iPad to Mac). That means a passkey registered once works on all of the user's devices.

2026: The Year of Passkey Adoption

With broad support from Apple, Google and Microsoft, passkey adoption reaches a turning point in 2026. Industry observers expect passkeys to arrive in the mainstream.

For online shops this means: implementing now secures a competitive edge. Whoever offers customers the most convenient and most secure login is ahead.

The Future of Login Starts Now

Passkeys solve the fundamental problems of passwords: security, usability, and phishing vulnerability. With a 98% success rate on Microsoft accounts (Microsoft), phishing resistance, and lightning-fast login, they are the ideal authentication for online shops.

We support you with passkey integration in your Shopware, WooCommerce, or custom shop. Contact us for consultation.