Opt-in is the explicit consent given by a customer to receive communications from a business. It is a legal requirement for most messaging channels, including WhatsApp Business, SMS, and marketing emails.
Opt-in types include single opt-in (one-step consent) and double opt-in (confirmation required). Collection methods include website forms, checkout flows, QR codes, SMS keywords, and in-app prompts. Records must be maintained for compliance audits.
InboxCentral provides opt-in collection widgets, consent tracking, and compliance tools for WhatsApp, SMS, and email.
Related InboxCentral feature
WhatsApp Business APIA mandatory registration system for commercial SMS in India.
WhatsApp's rule limiting free-form replies to 24 hours after the last customer message.
A pre-approved message format required for initiating WhatsApp conversations.