So, did some digging, and there is a Utility class that you can use for this.
To get a textField defined in the Properties class as
@CA_PAM_TextField(Name = "test", Label = "Test", Page = "Page")
String test;
You would have to use something like this in the Implementation Class:
final C2OValue password = SvcOpDataHelper.getServiceOperationDataByTypePlatform(getGroupName(), "test", getParamValueMap(), getConfigurationHandler(), C2OValueTypeList.STRING, "test");