Visa Stop Payment Service APIs use mutual SSL authentication method and channel encryption, which will require the issuer to obtain a user ID and password as well as to install a PKI certificate issued by Visa. You can receive the test credentials from the Project Dashboard for sandbox testing. Production credentials will be supplied to you as part of the production on-boarding process. Contact [email protected] for more information or to begin the production on-boarding process.
As one of the security protocols, Visa Developer sandbox secures its connections with clients by means of Two-Way SSL (Mutual Authentication) method. Refer to the link below to quickly learn about how to get credentials to start building with Two-Way SSL.
Visit the Two-way SSL Guide to learn more.