GET /o/oauth2/auth?response_type=code&redirect_uri=https://quizlet.com/google-login&client_id=520305074949.apps.googleusercontent.com&scope=profile+email&access_type=online&approval_prompt=auto&state={"state":"kTWrjEKytCtTRyFhFbrf7G","reauth":false,"from":"\/goodbye","signupOrigin":"global-signup-modal-google","screenName":"logout\/logoutmobilesplash"}

https://quizlet.com/google-login?state={"state":"kTWrjEKytCtTRyFhFbrf7G","reauth":false,"from":"\/goodbye","signupOrigin":"global-signup-modal-google","screenName":"logout\/logoutmobilesplash"}&code=4/0AQSTgQFzS9eHAd2HHL9-GEX4BsDgucBYuBwWuOFhFp8puAa1TgAihhDnQITlvHKRo8TTdA&scope=email+profile+openid+https://www.googleapis.com/auth/userinfo.email+https://www.googleapis.com/auth/userinfo.profile&authuser=0&prompt=none

GET /google-login?state={"state":"kTWrjEKytCtTRyFhFbrf7G","reauth":false,"from":"\/goodbye","signupOrigin":"global-signup-modal-google","screenName":"logout\/logoutmobilesplash"}&code=4/0AQSTgQFzS9eHAd2HHL9-GEX4BsDgucBYuBwWuOFhFp8puAa1TgAihhDnQITlvHKRo8TTdA&scope=email+profile+openid+https://www.googleapis.com/auth/userinfo.email+https://www.googleapis.com/auth/userinfo.profile&authuser=0&prompt=none

POST https://oauth2.googleapis.com/token
Content-Type: application/x-www-form-urlencoded

client_id=YOUR_CLIENT_ID
&client_secret=YOUR_CLIENT_SECRET
&code=4/0AQSTgQFzS9eHAd2HHL9-GEX4BsDgucBYuBwWuOFhFp8puAa1TgAihhDnQITlvHKRo8TTdA
&redirect_uri=https://yourwebsite.com/google-login
&grant_type=authorization_code

{
  "access_token": "ya29.A0AfH6SM...",
  "expires_in": 3600,
  "refresh_token": "1//0gQ...",
  "scope": "email profile openid",
  "token_type": "Bearer"
}

GET https://www.googleapis.com/oauth2/v3/userinfo
Authorization: Bearer ya29.A0AfH6SM...

POST /token HTTP/1.1
Host: authorization-server.com
Content-Type: application/x-www-form-urlencoded

grant_type=refresh_token
&refresh_token=eyJhbGciOiJIUzI1NiIsInR5cCI6IkpXVCJ9...
&client_id=your-client-id
&client_secret=your-client-secret

{
  "access_token": "new-access-token-123",
  "token_type": "Bearer",
  "expires_in": 3600
}

{
  "error": "invalid_grant",
  "error_denoscription": "Refresh token is expired"
}

POST /revoke
Content-Type: application/x-www-form-urlencoded

token=ACCESS_TOKEN
&client_id=your-client-id
&client_secret=your-client-secret