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

{ "offers": [ { "sales_reference": "001021910300785 ", "seller": { "identifier": "001" } }, { "sales_reference": "001021910300165 ", "seller": { "identifier": "001" } }, { "sales_reference": "001021910300579 ", "seller": { "identifier": "001" } }, { "sales_reference": "001021910301767 ", "seller": { "identifier": "001" } }, { "sales_reference": "001021910301536 ", "seller": { "identifier": "001" } }, { "sales_reference": "001021910301916 ", "seller": { "identifier": "001" } }, { "sales_reference": "001021910300967 ", "seller": { "identifier": "001" } }, { "sales_reference": "001021910301163 ", "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": "001021910300785___,001021910300165___,001021910300579___,001021910301767___,001021910301536___,001021910301916___,001021910300967___,001021910301163___", "delivery_get_method": { "delivery_type": "home_delivery", "center_id": "0130" } }