Does an apk created with Processing require Google Apps & Services?

A customer has asked me if my apk, which was produced with Processing for Android, requires GAPPS (Google Apps and Services). Do you know?

What I understand of GAPPS is that it is a package of apps, such as the Play Store, Gmail, Maps, etc. that you install after a limited ROM install. It’s not needed to install a Processing app. The only thing needed, is to allow install of third-party apps in the settings. And also that only if you don’t upload it to the Play Store.