Settlement follows authorization and transaction submission according to the payment system's rules. It may require clearing, ledger confirmation, finality thresholds, reconciliation, and recording that the obligation for a resource has been satisfied.
A provider that delivers irreversible work before settlement can bear credit or double-spending risk. Systems can wait, use escrow or vouchers, batch many purchases, or accept bounded exposure under clearly defined trust and dispute rules.
ELI5
Payment settlement is the stage when a payment has completed far enough that the recipient can rely on the value. Authorizing or sending a transaction is not always the same as final settlement.
For example, an agent may submit a stablecoin payment and receive a transaction reference immediately, while the service waits for the required network confirmation before releasing expensive data.

