OAuth invalid_grant error when requesting access token

Alpaca Integration Applications App-Integration
1

I’m having issues with oauth when requesting an access token, in exchange for an auth token. I have the client id and client secret correct, and redirect_uri is the same one as the one I used to retrieve the auth token.

I am receiving data: { code: 40010001, message: ‘invalid_grant’ } error with status: 422 .

Here is a code snippet. It is in TypeScript.

const tokenEndpoint = 'https://api.alpaca.markets/oauth/token';

    try {
      const data = new URLSearchParams({
        grant_type: 'authorization_code',
        code: authToken,
        client_id: this.ALPACA_CLIENT_ID,
        client_secret: this.ALPACA_CLIENT_SECRET,
        redirect_uri: this.ALPACA_REDIRECT_URI,
      });

      console.log('Request Data:', data.toString());

      const response = await axios.post(tokenEndpoint, data.toString(), {
        headers: {
          'Content-Type': 'application/x-www-form-urlencoded',
        },
      });

      console.log('Access Token Response:', response.data);

      return response.data.access_token;
    } catch (error) {
      console.error('Error exchanging authorization code:', error);
      throw error;
    }