get https://externalapi.retailrocket.net/api/3.0/productRecommendations/related
The algorithm returns related products that are most likely to be purchased along with the products for which recommendations are requested.
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.