How to setup Apple Pay

Hi I’m trying to setup Apple Pay and am stuck. I’ve read the documentation: https://stripe.com/docs/stripe-js/elements/payment-request-button#verifying-your-domain-with-apple-pay
I’ve setup the .well-kmown directory and uploaded the domain association file and verified my domain.
I’ve enabled Apple Pay in Sliced Invoices settings.
How do I then get AP to show as a payment option?
All I see is a pay with Stripe button.