Can I call cocos2d-x Class's method from objective-c AppController?

I know that we can call Objective-c method from cocos2d-x. (using ObjCCall.mm)

but, on the contrary to that,
is it possible to call cocos2d-x class’s method call from objective-c?

for example,
when payment request completed, I want to call display cocos2d-x popup method.

any idea plz…