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I am implementing apple sign in on my website On my backend(Nodejs), I need to request an authentication token using https://appleid.apple.com/auth/token REST api. I used Axios and coded as following export const createSignWithAppleSecret = () => { const token = jwt.sign({}, signWithApplePrivateKey, { algorithm: 'ES256', expiresIn: '1h', audience: APPLE_DOMAIN, issuer: APPLE_TEAM_ID, subject: APPLE_SERVICE_ID, keyid: APPLE_KEY_ID, }); return token; }; export const getAppleToken = async (code: string) => axios.post( 'https://appleid.apple.com/auth/token', qs.stringify({ grant_type: 'authorization_code', code, client_secret: createSignWithAppleSecret(), client_id: APPLE_SERVICE_ID, redirect_uri: APPLE_REDIRECT_URI, }), { headers: { 'Content-Type': 'application/x-www-form-urlencoded', }, } ); But I am getting Reqest failed with status code 400 Error: Request failed with status code 400\n at createError (/home/ubuntu/sooldamhwa/www/node_modules/axios/lib/core/createError.js:16:15)\n at settle (/home/ubuntu/sooldamhwa/www/node_modules/axios/lib/core/settle.js:17:12)\n at IncomingMessage.handleStreamEnd (/home/ubuntu/sooldamhwa/www/node_modules/axios/lib/adapters/http.js:260:11)\n at IncomingMessage.emit (events.js:327:22)\n at IncomingMessage.EventEmitter.emit (domain.js:485:12)\n at endReadableNT (_stream_readable.js:1201:12)\n at processTicksAndRejections (internal/process/task_queues.js:84:21) The api endpoint is correct, and I have configured header as document instructed( https://developer.apple.com/documentation/sign_in_with_apple/generate_and_validate_tokens) Could someone please let me know what I did wrong?