In the settings of your plugin, I have selected the option to display the Apple Pay button as one of the payment methods for the order on the Checkout Page. The documentation states that this button is only displayed on iOS devices. However, this button is displayed on my website in absolutely all cases, regardless of the device’s operating system or browser version. The same situation applies to the Google Pay button.
It’s not the button that’s showing, it’s the payment method list item and the Apple Pay icon. That’s happening because your theme is overriding the plugin’s default styling which has the Apple Pay list item hidden. When the plugin detects that Apple Pay is supported, it will show the Apple Pay payment method and render the button.
Indeed, I haven’t seen that theme overrides the plugin’s default styling which hides an Apple Pay list item. If I apply your styles, I won’t see the Apple Pay list item on iOS devices. It will be completely hidden.