get https://externalapi.retailrocket.net/api/3.0/categoryRecommendations/popularByPreferedSize
The algorithm returns popular products from the priority category of products that have a size available that the user is interested in.
Link
link
consists of a name and a value, in the query string the name and value are separated by a comma, example: link=card,12345, where card is the name and 12345 is the value.