WhatsApp coexistence: use the app and the API with the same number
Coexistence connects your WhatsApp Business to the API without taking it out of the app. How it works, what syncs, its limits and when to migrate fully.
Don Ernesto has a fruit stand that sells more on WhatsApp than in person. He has been serving customers from the same phone for eight years, with hundreds of loyal customers who write “the usual” every week. His daughter wants to connect a CRM and an AI agent, but there is a problem: Don Ernesto has no intention of letting go of his phone.
For years, that scenario had only one way out: choosing between the app and the API. Today there is a third option, and it is called coexistence.
What is WhatsApp coexistence?
It means connecting the number you already use on the WhatsApp Business app to the official WhatsApp platform (the API), without removing it from the app. The same number works on both sides at the same time:
- Your team keeps replying from the phone, as always.
- Your CRM and your AI agents receive and send messages through the API.
- Messages are mirrored between both, so nobody loses the thread.
Official providers such as GoHighLevel already offer it within their platforms, and it is turned on through the embedded signup of Meta's WhatsApp Business platform.
What is synced when you turn it on?
Your contacts and up to six months of chat history. From that moment on, every message sent or received appears on both sides. For Don Ernesto, it means his daughter can see all the customers from recent months in the CRM, without him losing anything on his phone.
What are the limits of coexistence?
It is very practical, but it is not the same as a direct migration to the API. These are its main limits:
- A cap of 20 messages per second for the number in coexistence.
- Some app features change: according to official providers such as Sanuker, broadcast lists, disappearing messages or view once may stop working the same way, and editing or deleting messages is no longer available in the app.
- It is turned on through an official path: Meta's embedded signup or an authorized provider.
Watch out: if your operation depends on high-volume mass campaigns, the cap of 20 messages per second may fall short. In that case it is better to migrate the number directly to the API.
Coexistence or direct migration: which suits me?
It depends on how you serve customers today and how much you are going to grow. This table summarizes the decision:
| If your business… | You should choose |
|---|---|
| Serves customers from the phone and wants to add a CRM or AI | Coexistence |
| Wants to keep the history and the use of the app | Coexistence |
| Runs high-volume campaigns | Direct migration |
| Has a large team serving customers from the CRM | Direct migration |
| Wants to start without changing habits | Coexistence |
A practical rule: start with coexistence if your team depends on the phone; migrate directly if your operation already lives in a CRM. On either path, Meta charges for messaging; we explain how in WhatsApp's new charges for replies.
How is it turned on, step by step?
- We verify that the number is on the WhatsApp Business app.
- We connect it with Meta's embedded signup from your business portfolio.
- Contacts and history are synced.
- We connect the number to your CRM or your AI agent.
- We set up the templates to write outside the 24-hour window.
That last step is key: to message a customer first you need approved templates, and each category costs differently. We explain it in WhatsApp templates: marketing, utility and authentication.
What does a business gain with coexistence?
- An AI agent serving customers at night without taking the phone away from the team. See what an AI agent for WhatsApp is.
- A CRM with the full history, to measure and follow up.
- Zero friction with customers, who keep writing to the same number.
In short
Coexistence is the smoothest way to move to the WhatsApp API: your team stays on the app, your CRM and your AI join in, and the history is not lost. Don Ernesto keeps selling from his phone, and now his daughter sees everything in the CRM. If your volume grows a lot, the next step is direct migration. In our WhatsApp Business API service we help you choose the path and leave it up and running.
Frequently asked questions
Do I lose my chats when I turn on coexistence?
No. Your contacts and up to six months of chat history are synced, and new messages are mirrored between the app and the API.
Can I run mass campaigns with coexistence?
You can send campaigns through the API, but a number in coexistence has a cap of 20 messages per second. For high-volume sends, a direct migration to the API is better.
Can any number use coexistence?
It must be a number already on the WhatsApp Business app and be connected through Meta's embedded signup or an official provider.
Do my customers notice any change?
No. They keep writing to the same number as always; on the other side, your team replies from the app and your CRM or AI agent from the API.
Can I move from coexistence to a direct migration later?
Yes. Many companies start with coexistence and migrate fully to the API when their volume or their team grows.
Do not stop at the theory: apply it to your business
We implement the WhatsApp Business API end to end, with your real operation. The first conversation is free.
