flutter_gcaptcha_v3

This project is a simple implementation of Google reCAPTCHA v3 in Flutter. It allows you to add a layer of security to your Flutter app by verifying that the user is not a robot.

Using the Plugin

Preparations

First, include the plugin in your project's dependencies by including it in the relevant section of your pubspec.yaml:

 dependencies:
  
  flutter_gcaptcha_v3: any

Google recaptcha V3 API key

To register a URL in reCAPTHCA, follow these steps:

• Go to the reCAPTHCHA admin console at https://www.google.com/recaptcha/admin

• Sign in using your Google account credentials Add Label name (eg: app name) Selected reCaPTHCA type as Challenge(V3),

• Add Domains: click on the “+ Add” button to register a website,

• For Testing purposes, we need to add a domain name as localhost In production, we can later add another real domain name (example.com)

• GOOGLE CLOUD PLATFORM: Add an app name and it will create a project to enable the required APIS

• Click Save and Submit

You will be given two keys:

• Site Key: used to show the captcha verification widget on your site.
• Secret Key: is used for authentication communication between the application & recaptcha server to verify the user’s response

Server-side verification

Using the secret key, the token obtained usign this package (flutter_gcaptcha_v3) is verified using this Google API https://www.google.com/recaptcha/api/siteverify.

To verify the token, we can directly call the above API or integrate the API into the backend server. Please find out more to verify the token here: https://developers.google.com/recaptcha/docs/verify