Hi, (ou bonjour)
Thanks to give us the screenshot of your payment method configuration.
As I can see:
Méthodes de paiement
Please specify what type of payment methods the Hosted Paypage solution will allow.
Cartes de crédit
NOTA : Du code supplémentaire est nécessaire pour accepter différents types de paiement, afin de traiter la réponse de transaction et de produire un reçu.
The payment method is configured only for credit cards, so it seems to be normal to only have the possibility to pay by credit card.
The screenshot will help us to undestand the situation.