Some requests to POST /wp-json/hrck/v1/track/visit return a 429 response for some of your visitors.
Why this happens. The 429 response is deduplication behavior. The Conversion Kit records one visit per visitor per page URL per 60 seconds. If a visitor reloads a page or navigates back to the same page within a minute, the request returns 429 and the first visit is kept. There is also a cap of 120 visits per IP address in 5 minutes, which applies to shared networks. In the normal case, no visit data is lost.
What you can do. Update to Conversion Kit 1.147.5 or later. From that version, a repeat visit within a minute returns 200 instead of 429.