On Shopify? Use the app instead — it covers the same ground with theme and checkout extensions.
Magento 2
Shopware 6
Copy the plugin intocustom/plugins/, then:
PrestaShop 1.7 and 8
Upload the module under Modules → Module Manager, install it, and paste your embed key in its configuration. SKUs use the productreference and fall back to the product id, because
plenty of catalogues leave reference empty.
BigCommerce
BigCommerce gives an app no template hook, so this one is a storefront script rather than a plugin. Paste it under Settings → Advanced → Script Manager, in the header, on all pages, with your key filled in. It reads the basket and the order from BigCommerce’s Storefront API, which is same-origin and unauthenticated — there is no API account to create and no token in the page. Two limits worth knowing before you install it:- Categories come from the breadcrumb. BigCommerce category URLs carry no marker, so there is nothing else reliable across themes. Where a theme has no breadcrumb, no category is sent rather than a guess.
- The order id is not in a consistent place. The script tries the query string, session storage and the URL path. If none has it, the sale is not reported — a sale that cannot be keyed is one that would be counted again on the next page reload.
What every adapter sends
Your own identifiers throughout. A SKU is resolved against your catalogue
server-side, so there is no id mapping to maintain.
Conversions are reported, not trusted
Orders arrive aspurchase_reported: weighted 0 and excluded from model
training, because a browser cannot prove a sale. They are for attribution.
Connect the same platform under Integrations and the verified order
supersedes the browser’s report on the same order id, rather than adding to
it.

