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How to update from Fingerprintjs Open-Source v2 to Fingerprint Pro:
  1. Sign up on dashboard.fingerprint.com/signup, create an account, and get a public API key.
  2. Change the @fingerprintjs/fingerprintjs or fingerprintjs2 package to @fingerprintjs/fingerprintjs-pro. If you use NPM, run: 
    npm remove @fingerprintjs/fingerprintjs fingerprintjs2 @types/fingerprintjs__fingerprintjs @types/fingerprintjs2
npm install @fingerprintjs/fingerprintjs-pro
    And replace the package name in your JavaScript/TypeScript code: 
    import Fingerprint2 from '@fingerprintjs/fingerprintjs'
import Fingerprint2 from 'fingerprintjs2'
import FingerprintJS from '@fingerprintjs/fingerprintjs-pro'
    If you use a CDN, switch to our CDN: 
    <script src="https://cdn.jsdelivr.net/npm/fingerprintjs2@2/dist/fingerprint2.min.js"></script> 
<script src="https://fpjscdn.net/v3/<<browserToken>>/iife.min.js"></script> 
<script>...</script>
  3. Replace requestIdleCallback with FingerprintJS.load. The function will return a promise that resolves with an agent object. The agent has a get method that you will use instead of calling Fingerprint2.get directly: 
    requestIdleCallback(() => { 
  Fingerprint2.get(result => { 
    const fpPromise = FingerprintJS.load() 
    fpPromise 
      .then(fp => fp.get()){ 
      .then(result => { 
        // Handle the result
      })
- })
  4. Add the public API key to the FingerprintJS.load() configuration: 
    FingerprintJS.load() 
FingerprintJS.load({ apiKey: '<<browserToken>>' })
  5. Use the visitor identifier directly (the raw components aren’t provided): 
      fp.get().then(result => {
   const values = result.map(function (component) { return component.value }) 
   const visitorId = Fingerprint2.x64hash128(values.join(''), 31) 
   const visitorId = result.visitorId 
  })
  6. Remember that the support of Internet Explorer 10 and older has been dropped. Some old browsers like Internet Explorer 11 and Android Browser 4.1 require a Promise polyfill. See the browser support guide to get a list of the supported browsers.