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Each of these reads what the platform already knows — the product, the category, the search term, the basket, the customer and the order — and hands it to the widget. None of them asks you to maintain hidden markup on your templates. They all do the same three things; only how each platform exposes its data differs. Source and install steps are in nsl-platforms.
On Shopify? Use the app instead — it covers the same ground with theme and checkout extensions.

Magento 2

Then Stores → Configuration → NeuronSearchLab: enable it and paste your embed key. Place a strip by adding the block to any layout handle:

Shopware 6

Copy the plugin into custom/plugins/, then:
Set the key in the plugin’s configuration. Place a strip anywhere in Twig:

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 product reference 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 as purchase_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.
None of these adapters has yet been exercised against a live store of its platform. They are structurally valid and the endpoints they call are covered by tests, but install each on a staging store before it reaches a merchant.