Why am I being charged to use my debit card?

Hello there, I'm wondering why I'm being charged a fee when using my debit card for transactions. Could you please explain the reasoning behind this charge? I've always used my debit card without any extra fees in the past, so I'm a bit confused about this new development. Could it be due to a change in policy or perhaps a specific type of transaction that I'm making? I'd appreciate any clarity you can provide on this matter. Thank you.