Make an SSH connection to the server running the API Gateway and select 8) Display Patch Management menu.

Welcome to the CA API Gateway - 9.3.00
running on Red Hat Enterprise Linux Server release 6.10 (Santiago)

This user account allows you to configure the appliance
What would you like to do?

 1) Configure system settings
 2) Display CA API Gateway configuration menu
 3) Use a privileged shell (root)
 4) Change the Master Passphrase
 5) Display Remote Management configuration menu
 6) Manage HSM
 7) Display CA API Gateway Enterprise Service Manager configuration menu
 8) Display Patch Management menu
 9) Display Log Viewing menu
 R) Reboot the CA API Gateway appliance (apply the new configuration)
 X) Exit (no reboot)

Please make a selection: 

Select 4) List Gateway patch history.

This menu allows you to manage CA Technologies patches on the
CA API Gateway Appliance

What would you like to do?

 1) Upload a patch to the Gateway
 2) Install a patch onto the Gateway
 3) Delete patches from the Gateway
 4) List Gateway patch history
 X) Exit menu

Please make a selection: 

The list of installed patches will be display, the the most recently installed patches listed first.

1) Patch ID CA_API_PlatformUpdate_64bit_v9.X-RHEL-2020-02-25 (Upgrades the CA API 64bit Platform to the 9.X-RHEL-2020-02-25 version. This patch requires that the 9.X Platform Update be installed first. It also requires a restart of the CA API Gateway Appliance.) is INSTALLED, last modified on 2020-04-08T10:21:51-0500

2) Patch ID CA_API_PlatformUpdate_64bit_v9.X-RHEL-2019-09-24 (Upgrades the CA API 64bit Platform to the 9.X-RHEL-2019-09-24 version. This patch requires that the 9.X Platform Update be installed first. It also requires a restart of the CA API Gateway Appliance.) is INSTALLED, last modified on 2019-10-24T08:15:21-0500

3) Patch ID CA_API_Gateway_v9.3.00.9885-CR05 (Upgrades the CA API Gateway Software to version 9.3.00.9885-CR05. This patch requires a reboot of the CA API Gateway Appliance after installation.) is INSTALLED, last modified on 2019-10-24T08:13:10-0500

4) Patch ID CA_API_PlatformUpdate_64bit_v9.X-RHEL-2019-06-24 (Upgrades the CA API 64bit Platform to the 9.X-RHEL-2019-06-24 version. This patch requires that the 9.X Platform Update be installed first. It also requires a restart of the CA API Gateway Appliance.) is INSTALLED, last modified on 2019-07-29T21:40:08-0500