Sometimes, if the 1st attempt fails, you just have to try again either with the same credit card, or with another available payment method such as Paypal for example, to unblock the situation.
Otherwise, you may need to check the validity date of your card.
If it's a new card, it must be activated beforehand by making a cash withdrawal or a payment at a merchant.
Otherwise, feel free to try connecting to the website with another search engine (Google Chrome) or to pay via Lydia.
If the problem persists, you can of course write to us at hello@rivedroite-paris.com or call us at 01 45 31 74 50