Is there a difference in the app when used with Bigcommerce versus Bigcommerce Enterprise?

Our product offering doesn't differ for BigCommerce or BigCommerce Enterprise. Both the end-user implementation and the app is the same.

How is the tag-field tags1 populated?

The tags1 field is populated using the search-keywords field of the associated Bigcommerce product.

How is the tag-field tags2 populated?

The tags2 field is populated by using the Custom Fields of the associated Bigcommerce product. The key and value are concatenated using a colon (":") as a delimiter. For example, if you had a custom field called "Colour" with the value "Red" - the associated tag2 would be Colour:Red

How is the tag-field tags3 populated?

The tags2 field is reserved for future use and is always empty.

How are the custom-fields populated?

The custom fields is populated by using the Custom Fields of the associated Bigcommerce product.