Prices are quoted in euros all taxes included. They take into account the French VAT applicable on the day of the order. The prices indicated on the site are guaranteed for the duration of online publication and within the limits of available stocks. The final price invoiced to the customer is the price indicated on the order confirmation. 
Payment is made by credit card: Visa, Eurocard, Mastercard or American Express. 
You can also do express checkout via PayPal or Applepay. 
Your bank account will be debited upon validation of your order. Knowing that there is always a delay from the banks, the validation of payment can sometimes take a day, from the validation of the order.