On 02/15/2023, we will be implementing planned payment gateway updates for Sandbox, beginning at 5:30 PM Pacific and this will be an extended maintenance.
For details on services intermittently inaccessible, please see our support article: Planned System Maintenance Service Impact
Though each service will be affected during the updates, no service should be unavailable for the entire maintenance window.
We apologize for any inconvenience this may cause and thank you for your patience as we work to enhance the payment gateway.
Please do not hesitate to contact the Authorize.net support team if you have any questions or concerns.
Authorize.net Support Center