I've been trying to purchase some cryptocurrency using my debit card, but I've been met with roadblocks and rejections. Could you explain why this is happening? Is it a security measure on the part of the cryptocurrency exchange or my bank? Are there specific types of debit cards that are more suitable for this type of transaction? What steps can I take to ensure a successful purchase? I'm eager to enter the world of crypto but this obstacle has been quite frustrating. Any insight you could provide would be greatly appreciated.