Payments: choose one online payment service, Stripe or Mollie, in Settings → Subscriptions. Choosing one turns the other off for invoices and subscriptions, so your clients are always offered the right one.
Updates
Mollie: a subscription that was prepared for Stripe but never started can now be activated as a Mollie subscription instead.
Fix
Subscriptions: the subscription page offered every payment service, so a Stripe subscription also showed a Mollie button that only gave an error (and the other way round). It now offers only the service the subscription was set up with.
Subscriptions: turning Stripe off as a payment method now also turns off Stripe subscriptions; before, the setting stayed on with no way to change it.