// 1. Redirect user to authenticate
window.location.href = 'https://inbox.dog/oauth/authorize?' +
  'client_id=YOUR_KEY&redirect_uri=YOUR_CALLBACK';

// 2. Exchange code for token (in your backend)
const response = await fetch('https://inbox.dog/oauth/token', {
  method: 'POST',
  headers: { 'Content-Type': 'application/json' },
  body: JSON.stringify({
    code: 'AUTH_CODE_FROM_CALLBACK',
    client_id: 'YOUR_KEY',
    client_secret: 'YOUR_SECRET'
  })
});
const { access_token } = await response.json();

// 3. Use token with Gmail API
const emails = await fetch(
  'https://gmail.googleapis.com/gmail/v1/users/me/messages',
  { headers: { Authorization: `Bearer ${access_token}` } }
);