Opt in Requirements for Whatsapp

A user must first consent to receive messages in WhatsApp by opting into them via a third-party channel. This can be any channel your business uses to communicate with people today such as — your website, mobile app, missed call, IVR, email, SMS, retail location, contact center and WhatsApp session-based messages.

• The opt-in must be an explicit i.e., triggered by a user action, such as entering a phone number or ticking a checkbox to indicate consent.
• Clear opt-in messaging so that a user knows what types of messaging the person is signing up for.
• Opt-ins must be maintained by the business and should be produced if WhatsApp requests for this information.
• Session based OPTINs are permitted. i.e., during the session message, the customer can express explicit consent to receive notifications from a brand. However please note, customer initiating a conversation on WhatsApp cannot be considered as an opt-in. If the user sends any message, brand can ask them if they are interested to opt in and post explicit consent from user, it can be considered as opt-in.