Square Authorization Route

square_authorize.js

const CLIENT_ID = process.env.APPLICATION_ID;
const SECRET = process.env.SECRET;

function getState() {
  return (crypto.randomBytes(32)).toString('base64');
}

router.get("/authorize", (req, res) => {
  if(req.auth.isLoggedIn) {
    res.redirect("/authorized");
  } else {
    const squareAuthURL = "https://connect.squareup.com/oauth2/authorize?";
    req.auth.state = getState();

    res.redirect(
      squareAuthURL + 
      `client_id=${CLIENT_ID}&` + 
      `response_type=code&` +
      `scope=MERCHANT_PROFILE_READ&` +
      `session=false&` + 
      `locale=en-US&` +
      `state=${req.auth.state}`
    );
  }
});