WhatsApp Opt-In Rules for Co-Existence Numbers
When using WhatsApp Co-Existence, businesses operate a single phone number on both the WhatsApp Business App and the WhatsApp Business API. While this gives flexibility, it does not exempt companies from WhatsApp’s opt-in rules. In fact, following opt-in requirements is essential for compliance with Meta policies, high message delivery rates, and better customer trust.
What Is Opt-In for WhatsApp Co-Existence?
Opt-in means that a user must explicitly agree to receive business messages on WhatsApp. This is required before sending any proactive messages via the API — even if the same user is already chatting through the WhatsApp Business App. WhatsApp considers ongoing app conversations as responses, but they do not count as API opt-in for campaigns or automated messages. To collect valid opt-in, it must be: • Explicit: Users clearly know they are agreeing to receive messages. • Informed: They understand what type of messages they will get. • Voluntary: Consent isn’t forced or assumed. Common opt-in collection methods include: • Website signup forms with a WhatsApp consent checkbox • Checkout pages where users provide WhatsApp and agree to messages • SMS or email with clear WhatsApp consent language • In-chat opt-in prompts where the user types “YES” to confirm
Opt-In and Message Types
Opt-in rules matter especially for template messages, including: • Order updates • Appointment reminders • Shipping notifications • Promotional alerts (where allowed) Without proper opt-in, template messages may be blocked or rejected by Meta.
Opt-Out and User Control
Meta also requires that users can opt out at any time. If a user sends “STOP”, “UNSUBSCRIBE”, or any equivalent, businesses must immediately stop sending messages via the API. Failure to respect opt-out increases the risk of user reports, which can lower your number’s quality rating or lead to restrictions.
Why This Matters for Co-Existence
Even though WhatsApp Co-Existence allows manual and automated messaging together, opt-in rules apply equally to both sides. API messaging without consent can damage deliverability or lead to policy action. Platforms like Celitix help manage opt-in lists, templates, and compliance — making it easier to use WhatsApp Co-Existence the right way.
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