Hi @hkiran2k! Our API can only accept calls coming from your backend server and will block any calls from the Client side with a CORS error.
I would recommend using one of our official SDKs for making calls to the Dwolla API via your application’s server if it’s written in one of the languages that we have an SDK for. Check out our collection - SDKs & Tools | Dwolla Payments Platform
Hope that helps. Let us know if you have any questions!