From my reactjs app, I get request_token in my Redirect URL after executing the login API. After getting request_token, I run another API to get access_token. This gives me a CORS error. 1. I tried adding the header in POST, in package.json and also in my NGINX, but I still get the CORS error. 2. Should my URL be whitelisted from your side? 3. Appropriate CORS access headers needs to be added from your server so that I can get it in my browser. Appreciate your help. Thanks.