Switch from DataFast by swapping one tag

01Swap the tag

Remove DataFast's tag and add yours, from the site's Setup page. Nothing else on your pages changes.

<script defer data-website-id="dfid_…" data-domain="yoursite.com" src="https://datafa.st/js/script.js"></script>

<script defer data-site="k3xq2mfa7twp" src="https://t.tallybyoutpost.com/script.js"></script>

02What keeps working

• data-website-id on the tag, read as data-site, and data-allow-localhost="true".
• window.datafast(name, props) calls, and DataFast's queue snippet for calls made before the script loads.
• data-fast-goal="name" attributes with their data-fast-goal-<key> properties (kebab-case becomes snake_case, as DataFast reads them).
• The datafast_visitor_id cookie: a returning visitor keeps it as their visitor id, and it stays renewed, so checkout code that reads it keeps linking sales.
• datafast_visitor_id in Stripe, Paddle, Lemon Squeezy or Polar metadata, read as it is.
• localStorage.datafast_ignore = true, which excludes a browser.
• DataFast's payment API calls: the same path and body (Payments API).

03What works differently

• data-domain is ignored: the script finds the widest domain that holds its cookie by itself.
• Cookieless mode, consent mode and hash routing are attributes of the one script (data-mode, data-hash), not separate files.
• data-api-url isn't read: a proxy is set with data-api. A DataFast proxy forwards to DataFast, so it changes in the swap anyway (Serving it from your domain).
• Goal properties: past 10, or with a bad key, the first 10 valid ones are kept, where DataFast drops the goal.
• datafast_session_id isn't written: sessions are worked out on the server, and sales are linked by the visitor id.
• datafast('identify', …) and datafast('payment', …) become an identify when they carry an email, which matches buyers by it. Names, images and custom keys aren't sent.
• Stripe Payment Links are tagged with the visitor's id (client_reference_id) on their own.
• A click on a link to any other host name counts as outbound, app.yoursite.com from www.yoursite.com included.

04What doesn't come with it

05Check it worked