Thanks for being part of the Visa Developer Community! We have API Explorer available for you to start testing code. Please take a look at our API Explorer. API Explorer lets you choose the Product API, Endpoint and Method to see the Request and Response. Here is the link to API Explorer - https://developer.visa.com/apiexplorer
In addition to that, we also have sample code that is downloadable and also on GitHub. Please see the documentation link below.
Getting Started with Visa Developer > Getting Started Guide > Sample Code For Project
Please let us know if you have other questions or need further assistance. Or feel free to poke around the Visa Developer Community Forum for a large abundance of questions and answers that may relate to your point in question.
Was your question answered? Don't forget to click on "Accept as Solution" to help other devs find the answer to the same question.
I was facing the same Problem. Since moderator's generic answer is not helpful at all, I found out that a request using "geocodes" with Lat/Lng didn't worked. However, using "placeName" instead worked for me. Although "geocodes" with Lat/Lng is marked as "required" and "placeName" is marked as "optional" in the Documentation, it seems like it's the the other way around.