WA Coexistence Messaging Limitation
Difference between WA Business App and WA Business API (for Coex)
When using WhatsApp Coexistence (Coex), businesses can use both the WhatsApp Business App (mobile device) and the WhatsApp Business API on the same number. However, messaging behavior differs depending on which platform is sending the message.
The 24-hour Customer Service Window (CSW) restriction applies strictly to messages sent via the WhatsApp Business API, but not in the same strict way on the WhatsApp Business App (device).
Key Differences
1. Messages sent from WhatsApp Business App (Device)
If a conversation is handled on the WhatsApp Business App, businesses can continue sending free-form messages even after 24 hours (for example, several days later).
There is no CSW-based cooldown that permanently blocks free-form messaging on the device, as long as the business complies with WhatsApp’s integrity, quality, and anti-spam policies.
2. Messages sent from WhatsApp Business API
If a conversation is handled through the WhatsApp Business API, the 24-hour CSW is strictly enforced.
After the 24-hour window expires:
Free-form messages cannot be sent
Businesses must use approved message templates to re-initiate the conversation
Free-form messaging is allowed again only after the customer/leads/contact replies
Key Takeaway
The restriction applies to the API, not the device.
When using Coexistence, the platform used to send the message determines whether the 24-hour rule applies.
Frequently Asked Questions
What happens if the customer does not reply?
If the customer does not reply, the Customer Service Window does not open.
However, the business can still send messages through the WhatsApp Business App (phone).
Can I send messages through the API if the customer has not replied?
No. If the CSW is not open or has expired, you must use an approved message template to send a message via the API.
Can I still message customers from the phone after 24 hours?
Yes. The WhatsApp Business App does not enforce the 24-hour restriction in the same strict way, so businesses can continue messaging customers from the device, provided messaging follows WhatsApp’s anti-spam policies.