Setting up the Chrome extension
The Chrome extension helps understand and manage the recommendations rules. What rule retrieved those products? Why? What value has variable X or Y?
Perform the following two-step integration:
Call the API to display recommendations to your website as usual. Each API call has a unique ID, there:

Store it so you can use it in the frontend.
Through JavaScript, push the unique ID into the dedicated Early Birds object that will be read by the extension:
window.ebRecoIds = window.ebRecoIds || [];
window.ebRecoIds.push('#RECOID#')
#RECOID# is to be replaced by the unique ID you got in the first step.
The Chrome extension is now able to read what was displayed by Early Birds on the page.
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