Hello,
You can integrate an external database with SPI endpoints. I recommend reviewing the following articles to learn how to set this up.
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https://support.wix.com/en/article/corvid-adding-and-deleting-an-external-database-collection
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https://support.wix.com/en/article/corvid-working-with-external-database-collections
From reading over the document you provided it seems like certain URL’s are provided which I’m assuming are endpoints to retrieve some data. If this is the case you use fetch to access this data from your Wix site. Click here to learn more.
Hope this helped!
Best regards,