authorizationUrl method
Build the /oauth/authorize URL for a PKCE challenge.
Implementation
Uri authorizationUrl(String challenge, String state) =>
Uri.parse(config.authorizationEndpoint).replace(queryParameters: {
'response_type': 'code',
'client_id': config.clientId,
'redirect_uri': config.redirectUri,
'scope': config.scopes.join(' '),
'state': state,
'code_challenge': challenge,
'code_challenge_method': 'S256',
});