In what correct order should the cash withdrawal process work in a real ATM?

The correct sequence of cash dispensing at an ATM is usually as follows:

1. Balance check and authentication — ensure there are sufficient funds in the account and the user has authenticated.
2. Preparation of banknotes — the ATM selects the required number and denominations of banknotes for dispensing.
3. Check for banknotes availability — ensure the selected banknotes are available in the cassettes.
4. Dispensing banknotes — the banknotes are mechanically dispensed to the user.
5. Confirmation of dispensing — sensors confirm that the banknotes have been dispensed correctly.
6. Update of status — funds are deducted from the account, and the number of banknotes in the cassettes is updated.
7. Receipt issuance and card return — final actions.

It is important that the cash dispensing operation is atomic: if an error occurs at any stage (for example, if banknotes get stuck), the operation should be canceled or rolled back to prevent deducting money without dispensing cash.