This is the core of the product. You pick a keyword (LINK, GUIDE, PRESETS) and when a comment contains it, INSTAX sends that commenter a private reply through the official Instagram Graph API. One reply per comment, inside Meta's 24-hour messaging window.
Exact or fuzzy keyword matching on comments
Target every post and Reel, or select specific ones
Optional public reply posted under the triggering comment
Meta's webhook retries are de-duplicated, so nobody is messaged twice
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