Moneris (Canada) with iOS & Android: Web iFrame or direct API?

Does Moneris (Canada) have or intends to have a native iOS / Android payment SDK for the Standard APIs (not Apple Pay) to process transactions; I did not find any SDKs while searching the dev portal.

I am curious if we are obliged to implement Moneris (Canada) via the Web iFrame solution, or the other option, which is calling the APIs directly (which has, as it seems, PCI/PA DSS issues with direct API), so what are our options.

The App needs to have some call back from the iFrame (if API is not an option) that the payment went though or not, in order to proceed with the purchase within the App.

Thank you for your time.