Are there any restrictions on the number of messages that can be received and sent in messengers?
To connect to the messengers API, these materials can help you.
Chat API offers the most accessible and automated connection to the messengers Business API on the market with instant access, a visual Chabot constructor that does not require code knowledge, and a Chat platform.
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You can send an unlimited number of messages via the Chat API.
At the same time, we do not recommend sending more than 6000 thousand messages per day (no more than 5-10 messages per minute) from one number. This is fraught with possible bans, if you need to send more than 6000 thousand messages, then the solution may be to purchase additional instances.
You can find out how to add and pay for instances here.
You can read our recommendations for working with the service to reduce the likelihood of being banned here.