Can I ad my own ad to the game I created?

Hello, I've created a simple ad placement system in the final game. The system is made this way. I created a simple server on Google Drive and from there the data I place belongs to the user in the game, In my case it is a small banner where I upload in the user's application the image with the advertisement and the link after which you can open the advertisement. I want to ask if this is allowed
Google Play and the App Store. I created this system to advertise my own games or maybe even other applications that address me to place their ad. I want to know if this is possible and if so what are the requirements?

In the placed image you see a banner model what the banner in the application looks like.