Puis-je modifier l'apparence de ma page de paiement PayPal par l'intermédiaire de MemberMouse ?

Non. Rien n'est fait du côté de MemberMouse pour modifier l'aspect de votre page de renvoi PayPal.  

Ceci étant dit, il y a deux choses à noter :

1. The PayPal account you have can influence the checkout page used on PayPal. As it’s a PayPal feature, we are not clear on how this works but we can say that older PayPal accounts will use different pages than new ones.

2. PayPal processes one-time payments differently than subscriptions. One-time purchases will go to a checkout page on PayPal that’s significantly different than the one for subscriptions. The reason is that with a subscription, a PayPal account is required; with a one-time purchase, it’s not. You can attempt to purchase a one-time purchase product and see the difference.