Bank Member

BorrowUI

Member Account

File manager

BookCopy

Librarian

PaymentSystem

request to borrow(BookID)

verifyMembership(memberID)

checkOutstandingFines(memberID)

fine amount

[alt] Fine exists / No Fine

Notify outstanding fine

Pay Fine

updateFineStatus(paid)

Confirm Payment

proceedWithBorrow()

requestBookBorrow(memberID, bookID)

checkAvailability(bookID)

available

markAsBorrowed(memberID)

confirmation

Borrow Confirmed