ProChatCommerce Help Center
How to set up an auto-responder
Send an automated message when people ask something in Messenger
Go to Campaigns tab and click Auto responder campaign.

If a user sends a message to your brand, they receive an automated response from you. Usually it says something like "Thank you for your message. We'll be in touch with you asap!"
It fires once in 24 hours for each user.
This is how typical Facebok Page looks like
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