Contract:

[DataContractAttribute]
class TestContractClass
{
str testParameter;

[DataMemberAttribute('Test Parameter')]
public str parmTestParameter(str _testParameter = testParameter)
{
testParameter = _testParameter;

return testParameter;
}
}

Service:

class TestService
{
public void process(TestContract _testContract)
{
// INSERT LOGIC HERE
}
}

Controller:

class TestController
{
protected void new()
{
super(classStr(TestService), methodStr(TestService, Process), SysOperationExecutionMode::Synchronous);
}

public ClassDescription defaultCaption()
{
return "@ClassDescriptionLabel";
}

public static void main(Args _args)
{
TestController controller = TestController::construct();

controller.parmArgs(_args);
controller.startOperation();
}
}

Action Menu Item:

Properties: