Are there any limits on how many messages I can send?
This article details the limits associated with the Walution extension.
There are no limits imposed by Walution on how many messages that can be sent in a given licensed period.
However, Walution sends messages at a maximum rate of 5 messages per minute. This means that a maximum of 7,200 messages can be sent in a 24 hour period.
This send rate reduces the chances of your phone number being associated with a spammer by WhatsApp, and therefore helps to avoid your phone number becoming blocked. Nevertheless, this is not a guarantee that your number will not be blocked. If you send thousands of messages of the same text, WhatsApp will still likely block your number.
Each user on a team license can send messages from a maximum of one WhatsApp phone number at a time.