How to install the «Yandex.Kassa» and «QIWI Wallet» payment extensions?

«Yandex.Kassa» and «QIWI Wallet» payment extensions are not released yet.
For now there only «Robokassa» payment extension is ready for Russian market.
«Yandex.Kassa» and «QIWI Wallet» will be released when I will want so (now I have more profitable projects), or when somebody orders them on the terms of my custom payment gateway integration service.