Welcome to the Community!
Are you referring to carrier billing? I realize it's quite a handy feature. Please follow the steps listed under the article Set up Rogers billing as payment method for Google Play store to learn more.
Please be advised direct carrier billing is only available using the Google Play Store app. It is not available on the Google Play website.
For Apple users, while the Mobile phone billing availability isn't available in Canada, you could look into setting up Apple pay on your device. I realize it's not the same thing as carrier billing but it's a convenient way to bypass use of physical cards.
Hope this helps 🙂