Hey @nabeel-legend,
I'm happy to help answer your question. My apologies for the delay in responding to your post. Please refer to the “Working with Visa APIs” link below for a guide that shows you how to create a Visa Developer project, credentials, and how to validate your connection.
https://developer.visa.com/pages/working-with-visa-apis
To test in the sandbox environment, please use the test data for your Visa Developer application that's available in the Dashboard under test data in the left navigation.
To download Sample Code, login to your Visa Developer Portal account and go to “My Account” > “Dashboard” > select Project > “Sample Code” > then select the code language and click on the “Download … Code” button.
Thanks,
Diana
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