From FingerprintJS Open-Source v3

How to update from Fingerprintjs Open-Source to Fingerprint in 30 seconds:

1. Sign up on dashboard.fingerprint.com/signup, create a account, then get a public API key.

2. Change the @fingerprintjs/fingerprintjs package to @fingerprintjs/fingerprintjs-pro:

   NPMYarnCDNCDN (legacy variant 1)CDN (legacy variant 2)

   Run:
   npm remove @fingerprintjs/fingerprintjs
   npm install @fingerprintjs/fingerprintjs-pro
   
   And replace the package name in your JavaScript/TypeScript code:
   - import FingerprintJS from '@fingerprintjs/fingerprintjs'
   + import FingerprintJS from '@fingerprintjs/fingerprintjs-pro'
   

   Run:
   yarn remove @fingerprintjs/fingerprintjs
   yarn add @fingerprintjs/fingerprintjs-pro
   
   And replace the package name in your JavaScript/TypeScript code:
   - import FingerprintJS from '@fingerprintjs/fingerprintjs'
   + import FingerprintJS from '@fingerprintjs/fingerprintjs-pro'
   

   Change the script URL:
     <script>
   -   const fpPromise = import('https://openfpcdn.io/fingerprintjs/v3')
   +   const fpPromise = import('https://fpjscdn.net/v3/<<browserToken>>')
         .then(FingerprintJS => FingerprintJS.load())
   
       // ...
     </script>
   

   Change the script URL:
     <script>
       // Initialize the agent at application startup.
       const fpPromise = new Promise((resolve, reject) => {
         const script = document.createElement('script');
         script.onload = resolve;
         script.onerror = reject;
         script.async = true;
   -     script.src = 'https://openfpcdn.io/fingerprintjs/v3/iife.min.js';
   +     script.src = 'https://fpjscdn.net/v3/<<browserToken>>/iife.min.js';
         document.head.appendChild(script);
       })
         .then(() => FingerprintJS.load());
   
       // ...
     </script>
   

   Change the script URL:
   - <script src="https://openfpcdn.io/fingerprintjs/v3/iife.min.js"></script>
   + <script src="https://fpjscdn.net/v3/<<browserToken>>/iife.min.js"></script>
     <script>
       // ...
     </script>
   

3. Add the public API key to the FingerprintJS.load() configuration:

   NPM/YarnCDN

   - FingerprintJS.load()
   + FingerprintJS.load({ apiKey: '<<browserToken>>' })
   

   Put the key to the agent script URL:
   https://fpjscdn.net/v3/YOUR_PUBLIC_KEY
   
   For example:
   https://fpjscdn.net/v3/token
   https://fpjscdn.net/v3/token/iife.min.js
   

That's it, the visitorId has pro-level accuracy of 99.5% now.