UML sequence diagram - naming / system assumption

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I want to make a sequence diagram of below scenario

  1. User clicks 'Pay' button
  2. X asks for card payment details.
  3. Use enters card number, expiry date ect (...)
  4. X sends a request to the bank for payment authorization.

How can I name the object X, other than the system, because a system is in fact a whole in which a sequence diagram happens?

For school purposes, is it correct to assume in the scenario that the system I am creating asks for card details (i.e. stores them) and sends a request to the bank for authorization?

scenarios sequence system diagram uml
1 Answers

Not really. What you call system is actually an instance of a certain class dealing with the authorization. If there were only one class to handle it all you probably would not need any (UML) design at all. The X would probably be an instance of Authorization.

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