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Managing Meta Messenger Referrals in Flow Builder
Before starting, you’ll need:
The rich automation capabilities of Flow Builder enable you to create a Flow scenario, depending on your use case, of how you want to handle these inbound messages.
Let's say you have created a Facebook Messenger conversation advertisement with a Get Started call to action, initiating a Messenger conversation:

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3) Create the desired automation scenario of the Flow, be it replying to the end-users message via a customized chatbot Flow, collecting inputs into an external Google Sheet, or managing the conversation in Inbox.

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Meta Messaging Referrals have a set of variables that can be exploited in Flow Builder. Variables starting with:
conversationMessageFacebookReferral
correspond to messages from m.me link with a referral parameter and Facebook Chat PluginconversationMessageFacebookReferralAd
relate to values populated when end-users click on call to action on Facebook Ads.