Por la compra de 3 unidades iguales o combinadas de los siguientes artículos, GRATIS el de menor importe

{ "offers": [ { "sales_reference": "001018630003251 ", "seller": { "identifier": "001" } }, { "sales_reference": "001018630003376 ", "seller": { "identifier": "001" } }, { "sales_reference": "001018630001032 ", "seller": { "identifier": "001" } }, { "sales_reference": "001018630001917 ", "seller": { "identifier": "001" } }, { "sales_reference": "001018630004291 ", "seller": { "identifier": "001" } }, { "sales_reference": "001018630001388 ", "seller": { "identifier": "001" } }, { "sales_reference": "001018630004283 ", "seller": { "identifier": "001" } }, { "sales_reference": "001018630004309 ", "seller": { "identifier": "001" } } ], "subsite": { "identifier": "supermarketStore", "parent": { "identifier": "supermarket" } }, "query_params": { "centers": { "home_delivery": "0130" }, "is_full_documentation": false, "is_include_offer_availability": true }, "query_list_get_method": "001018630003251___,001018630003376___,001018630001032___,001018630001917___,001018630004291___,001018630001388___,001018630004283___,001018630004309___", "delivery_get_method": { "delivery_type": "home_delivery", "center_id": "0130" } }