As a plugin developer you can use this plugin as dependency of your plugin by adding a dependency tag to your POM.
To add the latest version of this plugin as a maven dependency, use the following:
<dependency>
<groupId>io.jenkins.plugins</groupId>
<artifactId>digicert-software-trust-code-sign</artifactId>
<version>18.v7ec4e7c19a_1b</version>
</dependency>