My questions are actually 3-folds:
Hey @klt39429,
Here's a link to Create a CSR File for Visa Developer Project - https://developer.visa.com/pages/going-live#create_a_csr_file_for_visa_developer_project
The sandbox environment uses test data and you cannot test with real data. To learn more about how to get started with creating a Visa Developer project, conducting sandbox testing, to submitting a Go Live request for production, please go to this Working with Visa APIs link - https://developer.visa.com/pages/working-with-visa-apis
Here are the ping end points for Visa Developer Platform:
Sandbox environment: https://sandbox.api.visa.com/vdp/helloworld
Certification environment: https://cert.api.visa.com/<URI>
Production environment: https://api.visa.com/<URI>