Is it permissible for a training center to use a payment device from a usurious bank that charges 2%, knowing that transferring funds to an Islamic bank takes two days?

It is permissible for the center to collect fees for its courses from students via Visa card, even if issued by usurious banks, because the center is collecting its due from someone referred to it by the trainee. As for the center's agreement with a usurious bank to provide the center with a device and take 2% on each transaction, this is a permissible rental of the device for a known fee. However, it is preferable to deal with an Islamic bank if available.