Replacement variables are not very discoverable in the docs (I only found them after your comment, by using the ai assistant), and the docs don't reflect the app I see in your demo account (I see no personalize button when editing a template, and I don't know what it would do if it were there). I would recommend fleshing out the docs and linking them and/or the ai assistant in the app to make features more discoverable. twilio and stripe carved their market even more with documentation and code snippets than with features. Also, having a tier or three between 1 + 2 would be absolutely essential if you ever desired to get smaller businesses to use your product.