Is it permissible to use a credit card from a friend to guarantee bookings or online purchases, and what is the ruling on financial dealings with the holder of this card, and is it permissible to send money to a seller's account in an interest-based bank to purchase something?

It is permissible to use a Visa card for buying, selling, leasing, and similar transactions if the card is issued within the bounds of Islamic law. It is not permissible if the issuing entity imposes usurious conditions. It is also not permissible to use another person's card that was obtained through unlawful means, as this constitutes aiding in sin. As for placing a virtual credit card number in an online purchase request, it is impermissible because it involves deception and unlawfully consuming the merchant's wealth if the item is obtained without paying the price. It is permissible to deposit the price of the purchased item into the seller's account in a usurious bank if this is the only way to pay the price.