You've reached the Visa Developer Platform where you can integrate with Visa's APIs according to your needs.
Please take a look at our API Browser page for all Visa Developer APIs exposed through the platform and pick the right one that fit your needs. Click here to go to our API Browser - https://developer.visa.com/apibrowser
• The authorizations would happen through VisaNet, our electronic payments network. • Only Financial institutions such as issuer/acquirer banks get an access to VisaNet. Very large merchants also get VisaNet access through different services.