OAuth

https://your-app.com/callback?code=AUTHORIZATION_CODE&state=YOUR_STATE

https://your-app.com/callback?error=invalid_request&error_description=Requested+scope+exceeds+the+client%27s+registered+scopes&state=YOUR_STATE

{
  "access_token": "eyJhbGciOiJIUzI1NiIs...",
  "refresh_token": "eyJhbGciOiJIUzI1NiIs...",
  "token_type": "bearer",
  "expires_in": 1800,
  "scope": "BOOKING_READ BOOKING_WRITE"
}

{
  "access_token": "eyJhbGciOiJIUzI1NiIs...",
  "refresh_token": "eyJhbGciOiJIUzI1NiIs...",
  "token_type": "bearer",
  "expires_in": 1800,
  "scope": "BOOKING_READ BOOKING_WRITE"
}

https://app.cal.com/auth/oauth2/authorize?client_id=YOUR_CLIENT_ID&redirect_uri=YOUR_REDIRECT_URI&state=YOUR_STATE&scope=BOOKING_READ%20BOOKING_WRITE

npm install @calcom/atoms

import { OnboardingEmbed } from "@calcom/atoms";
import { useState } from "react";

function App() {
  const [state] = useState(() => crypto.randomUUID());

  return (
    <OnboardingEmbed
      oAuthClientId="your_client_id"
      authorization={{
        scope: ["BOOKING_READ", "BOOKING_WRITE", "PROFILE_READ"],
        redirectUri: "https://your-app.com/cal/callback",
        state,
      }}
      onAuthorizationAllowed={({ code }) => {
        fetch("/api/cal/exchange", {
          method: "POST",
          body: JSON.stringify({ code, state }),
        });
      }}
      onError={(error) => console.error(error.code, error.message)}
      onClose={() => console.log("Dialog dismissed")}
    />
  );
}

https://your-app.com/cal/callback?code=AUTHORIZATION_CODE&state=YOUR_STATE

import { OnboardingEmbed } from "@calcom/atoms";
import { useState } from "react";

function App() {
  const [state] = useState(() => crypto.randomUUID());

  return (
    <OnboardingEmbed
      oAuthClientId="your_client_id"
      authorization={{
        scope: ["BOOKING_READ", "BOOKING_WRITE", "PROFILE_READ"],
        redirectUri: "https://your-app.com/cal/callback",
        state,
      }}
      onError={(error) => console.error(error.code, error.message)}
    />
  );
}

<OnboardingEmbed
  trigger={<button>Connect calendar</button>}
  // ...
/>

<OnboardingEmbed
  oAuthClientId="your_client_id"
  theme="light"
  user={{ email: "bob@yahoo.com", name: "Bob", username: "bob100" }}
  authorization={{
    scope: ["EVENT_TYPE_READ"],
    redirectUri: "https://your-app.com/cal/callback",
    state,
  }}
  onAuthorizationAllowed={({ code }) => {
    alert(`Success! Auth code: ${code}`);
  }}
/>

import { OnboardingEmbed } from "@calcom/atoms";
import { useMemo, useState } from "react";

async function generatePkce() {
  const array = new Uint8Array(32);
  crypto.getRandomValues(array);
  const codeVerifier = btoa(String.fromCharCode(...array))
    .replace(/\+/g, "-").replace(/\//g, "_").replace(/=/g, "");

  const digest = await crypto.subtle.digest("SHA-256", new TextEncoder().encode(codeVerifier));
  const codeChallenge = btoa(String.fromCharCode(...new Uint8Array(digest)))
    .replace(/\+/g, "-").replace(/\//g, "_").replace(/=/g, "");

  return { codeVerifier, codeChallenge };
}

export function MyApp() {
  const state = useMemo(() => crypto.randomUUID(), []);
  const [pkce, setPkce] = useState<{ codeVerifier: string; codeChallenge: string } | null>(null);

  useMemo(() => {
    generatePkce().then(setPkce);
  }, []);

  if (!pkce) return null;

  return (
    <OnboardingEmbed
      oAuthClientId="your_client_id"
      authorization={{
        scope: ["EVENT_TYPE_READ"],
        redirectUri: "https://your-app.com/cal/callback",
        state,
        codeChallenge: pkce.codeChallenge,
      }}
      onAuthorizationAllowed={async ({ code }) => {
        // Exchange using code_verifier instead of client_secret
        const res = await fetch("https://api.cal.com/v2/auth/oauth2/token", {
          method: "POST",
          headers: { "Content-Type": "application/json" },
          body: JSON.stringify({
            client_id: "your_client_id",
            code_verifier: pkce.codeVerifier,
            grant_type: "authorization_code",
            code,
            redirect_uri: "https://your-app.com/cal/callback",
          }),
        });
        const { access_token, refresh_token } = await res.json();
      }}
    />
  );
}

interface OnboardingError {
  code: "INVALID_PROPS" | "SIGNUP_FAILED" | "ONBOARDING_FAILED" | "AUTHORIZATION_FAILED" | "STATE_MISMATCH" | "UNKNOWN";
  message: string;
}