The Stripe Checkout flow these days (for a saved card):

• Press "Pay".
• Loading...
• Confirm you are "human" and not a bot (sigh...).
• Loading...
• Confirm your card with TouchID, because last time it gave you an option to set that up and you were gullible enough to do it.
• Press on "TouchID" button, new window/tab opens, press the same button again.
• TouchID prompt. Place finger on Touch ID.
• Window closes.
• Loading... Thinking about it...
• Now to confirm the payment with your bank.
• Open bank app and press "approve"
• Loading... More thinking time...
• Loading...
• Oh and payment went through!
• Redirect to original site...
• ... loading... waiting... (I know why this is happening at least, because they need to make sure the payment flow worked).
• ... and DONE

I reckon this should just be "Press Pay, TouchID/Passkey, Done".