Why do I have to pay a surcharge?

Excuse me, could you please clarify why I'm being charged a surcharge for this transaction? I've made similar transactions in the past without any additional fees. Is there a specific reason for this surcharge, or is it a standard fee that applies to all transactions of this type? I'd appreciate it if you could provide me with more information on the surcharge and how it's calculated. Thank you for your time and assistance.