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Hey @Lambo85,
To get started, please check our API Browser for an API that you'd like to use for your project. Here's the link to the API Browser.
Click on this Working with Visa APIs link for steps on how to register and create a Visa Developer application. The Working with Visa APIs link will help guide you with the Visa Developer project application creation, credentials, and connection validation.
Per your payments use case, please visit our Payment Methods APIs link to see if you'd like to use Visa Direct or Visa Checkout for your project.
If you have other questions, please let us know and someone will be happy to help.