To summarize:
All prices are in € (it will be necessary to make the conversion when you buy), prices do not change, it's just that Braintree will propose unique purchases like Paypal but that the commission will make the price more attractive.Paypal is managed because of its operation (you can recharge your account and pay with the balance), which does not necessarily require a credit card.
The change between Wordplay and Braintree will have to be done manually at the end of your next payment term (1, 3, 6, or 12 months).