24-hour session rule
Businesses may send free-form session messages only when the user has sent a message (or otherwise engaged) within the last 24 hours on that channel. Outside that window, you must use an approved WhatsApp template via Send template message.Retrieve active sessions
CallGET /v1/chatapi/active-users to list active sessions for the authenticated vendor.
Each item includes:
The response field is spelled
sesssion_start_time (three s) in the API — match this exactly when parsing.Typical workflow
- Call Get active sessions to find users you can message.
- Use the
from_addrvalue as thetofield in Send session message. - Optionally set
callback_urlto receive inbound replies at your server.
