Hey @ rasith,
Can you please try again? Are you able to call Hello World? To make a call to Hello World, try using your project app's User Id, Password, Public Key and Private key then make sure to hit the "JKS" button before you hit "Run".
Endpoint is https://sandbox.api.visa.com/vdp/helloworld
Please refer to user guide (https://developer.visa.com/pages/visa-developer-center-playground)
Please let us know if you're still experiencing a problem or if the issue is resolved.
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