WhatsApp Business Management - Add Phone Numbers API | Developer Documentation

Use a phone number you control with ChatArchitect

ChatArchitect does not supply or sell phone numbers. Choose your own suitable number and connect it using the supplied setup. A Meta provider's phone-number pool API is not a way to purchase a number through the ChatArchitect API.

Prepare the number and the account

1. Identify the business that will use the number and the person responsible for its Meta portfolio.
2. Confirm that you control the number and can receive the required verification SMS or voice call.
3. Check its existing WhatsApp registration. If it already serves an app or another provider, prepare that existing number before changing a working connection.
4. Record the CRM/help desk workspace or custom application that should handle messages after setup.

For number suitability and the supplied connection steps, use the business phone number guide. A landline or toll-free number needs a verification call that can actually reach you; resolve an IVR or forwarding obstacle before starting that step.

Connect through the supplied flow

Use the agreed ChatArchitect connection route, choose the intended business portfolio and add the number as directed by the setup. Complete the SMS or call verification in the screen that requested it. Then finish configuration in the tool that will send and receive messages.

If several business assets are offered, compare them with your account record. If an expected asset is missing, check the business access required for that task rather than creating an unrelated account.

For a custom application

After the number connection is prepared, use the issued App key/App ID and Secret with the ChatArchitect API Quick Start. These credentials authenticate the documented service requests; they do not authorize Meta's add_phone_numbers endpoint or establish a number purchase workflow.

Before considering setup complete

Check an agreed outgoing message and incoming reply in the intended tool, together with the result that tool exposes. A verified number and a working application route are different parts of readiness.