For all Two-Way SSL (Mutual Authentication) projects, inbound credentials have an expiration date. Once it is about to expire, you can request for a new set of credentials.
You can have Visa Developer generate a CSR for you (default) or submit your own CSR. Refer to the Create Project section for details.
Once the new credentials are generated, you will see two set of credentials in you dashboard. Credentials include certificate, user Id and password. You must use the complete credential set in order to proceed with the next steps.
Note: Old credentials will continue to work till the expiration date. After the expiration date, it will not show up in the dashboard and will stop working.