Stripe will normally only accept valid cards. If Stripe reject the card, it's details will not be deleted from Beds24.
=== Refund of Payments in Stripe ===
There are two types of card collection at stripe:
1) Deposit collection via our booking page, this is a real charge and needs to be refunded manually.
2) Card passed from channel like booking.com to stripe, this is the one where the card is not charged by us, the hotel can both charge and refund the card manually.