FitMyKB Verify
One call shows the check in a bottom sheet and returns a one-time token for your server. Android and iOS, in 35 languages.
Download the SDK zip from the docs and copy its sdk/flutter folder into your project, then add it as a path dependency. It uses webview_flutter and nothing else.
# pubspec.yaml: the Flutter SDK is the sdk/flutter folder of the SDK zip
dependencies:
fitmykb_verify:
path: ./packages/fitmykb_verifyIn your dashboard, add the app's package name or bundle id (for example com.example.shop) as one of the site key's websites. That's the only setting.
FitMyKBVerify.verify opens a bottom sheet with the check and returns the token, or null if the person closes it. Language, theme, size and puzzle style work as on the web.
import 'package:fitmykb_verify/fitmykb_verify.dart';
Future<void> createAccount(BuildContext context) async {
final token = await FitMyKBVerify.verify(
context,
siteKey: 'YOUR_SITE_KEY',
appId: 'com.example.shop', // your package name / bundle id
language: 'hi', // or leave it out to follow the phone
);
if (token == null) return; // the person closed the sheet
// Send the token to YOUR server, which checks it with siteverify.
await api.signUp(email, password, captcha: token);
}Send the token with the sign-up request. Your server posts it to siteverify with the secret. Never put the secret in the app: anyone can read an app's files.
Pass action: 'signup' to skip the box entirely: the sheet closes by itself and your server gets a score from 0 to 1.