The lawsuit is about app distribution on iOS as well as the 30% cut.
There won't be anymore than what the web already has. Stripe or Paypal would likely be popular choices. Payment processors are required by law to be PCI compliant, though that doesn't guarantee they are.
Yes I would do payments in a non app store app with their own payment provider if I felt I trusted the app. It's no different than paying on any website (there's no Apple review process for websites).
There won't be anymore than what the web already has. Stripe or Paypal would likely be popular choices. Payment processors are required by law to be PCI compliant, though that doesn't guarantee they are.
Yes I would do payments in a non app store app with their own payment provider if I felt I trusted the app. It's no different than paying on any website (there's no Apple review process for websites).