soupui maven plugin licence

Hi,

I used a soapui maven plugin called maven-soapui-extension-plugin https://github.com/redfish4ktc/maven-soapui-extension-plugin. This plugin is under Apache License 2.0. It uses soapui maven pro plugin. I want to know whether i have to buy soapui maven pro plugin or can use maven-soapui-extension-plugin for a opensource project with out any legal issue?

Thanks,

Waruna