To initiate the authentication process, your application needs to redirect the user to the FuturePass authorization endpoint. Steps:
  1. Generate Code Verifier and Challenge: Use PKCE (Proof Key for Code Exchange) to enhance security.
  2. Generate State and Nonce: These are used to prevent CSRF attacks and replay attacks, respectively.
  3. Build Authorization URL: Include required parameters such as response_type, client_id, redirect_uri, scope, code_challenge, code_challenge_method, state, and nonce.
Example Authorization URL: 
const params = {
  response_type: 'code',
  client_id: clientId,
  redirect_uri: redirectUri,
  scope: 'openid profile email',
  code_challenge: codeChallenge,
  code_challenge_method: 'S256',
  state: state,
  nonce: nonce,
}

const queryString = new URLSearchParams(params).toString()
const url = `${authorizationEndpoint}?${queryString}`
window.location.href = url
Authorization Request Parameters
ParameterDescription
response_typeSpecifies the type of response. For authorization code flow, use code.
client_idThe client ID you obtained during client registration.
redirect_uriThe URI to which the response will be sent. It must match the redirect URI registered with the client.
scopeA space-separated list of scopes. Use openid.
code_challengeThe PKCE code challenge.
code_challenge_methodThe method used to generate the code challenge. Use S256.
stateA random string to maintain state between the request and callback. Helps prevent CSRF attacks.
nonceA random string to associate with the ID token. Helps prevent replay attacks.
response_modeSpecifies how the result should be returned. For this example, use query.
promptSpecifies whether the user should be prompted for reauthentication.
login_hintemail:, social:google, social:facebook
Example Authorization Request URL 
https://login.futureverse.dev/auth?
response_type=code&
client_id=YOUR_CLIENT_ID&
redirect_uri=http://localhost:3000/callback&
scope=openid&
code_challenge=CODE_CHALLENGE&
code_challenge_method=S256&
state=STATE&
nonce=NONCE&
response_mode=query&
prompt=login&
login_hint=email: