service_payment mail is not working

payment: |
        Il réglera par %{payment_method}, à %{amount} € par mois.

mais amount n'est pas passé comme argument

    payment: if @payment_method.nil?
               t('.no_payment')
            else
              t('.payment', payment_method: t(@payment_method, scope: :payment_method).downcase)
            end,

du coup ca échoue sur :

BoardMailer service_payment renders the headers
BoardMailer service_payment renders the body
TreasurerMailer service_payment renders the headers
TreasurerMailer service_payment renders the body