Volopay cards are preloaded, meaning you can only pay for transactions whose value is lesser than the funds loaded on the card. If there isn't enough money on your subscription card, your payment may have been refused.
In that case, we advise you to: Check that your current subscription plan isn't above the price set on the budget for your recurring payments card. If not, the payment will fail.
If you have sufficient balance and yet the payment is declined, check our article which helps you to pay with Paypal using Volopay cards.