Opt-in / Opt-out

Opt-in is the process by which a user explicitly consents to receive messages from a business, typically via a web form, keyword SMS, or checkbox. Opt-out is the mechanism for a user to withdraw that consent, usually by replying STOP or clicking an unsubscribe link. Maintaining compliant opt-in records and honouring opt-out requests immediately is a legal requirement under GDPR, TCPA, and most national telecom regulations.