Por la compra de 4 unidades iguales o combinadas de los siguientes artículos, GRATIS el de menor importe

{ "offers": [ { "sales_reference": "001028024302946 ", "seller": { "identifier": "001" } }, { "sales_reference": "001028023806194 ", "seller": { "identifier": "001" } }, { "sales_reference": "001028023806202 ", "seller": { "identifier": "001" } }, { "sales_reference": "001028024302961 ", "seller": { "identifier": "001" } }, { "sales_reference": "001028023806186 ", "seller": { "identifier": "001" } }, { "sales_reference": "001028023806210 ", "seller": { "identifier": "001" } }, { "sales_reference": "001028024103435 ", "seller": { "identifier": "001" } }, { "sales_reference": "001028024103443 ", "seller": { "identifier": "001" } }, { "sales_reference": "001028024103450 ", "seller": { "identifier": "001" } }, { "sales_reference": "001028024302953 ", "seller": { "identifier": "001" } } ], "subsite": { "identifier": "supermarketHipercorStore", "parent": { "identifier": "supermarket" } }, "query_params": { "centers": { "home_delivery": "0130" }, "is_full_documentation": false, "is_include_offer_availability": true }, "query_list_get_method": "001028024302946___,001028023806194___,001028023806202___,001028024302961___,001028023806186___,001028023806210___,001028024103435___,001028024103443___,001028024103450___,001028024302953___", "delivery_get_method": { "delivery_type": "home_delivery", "center_id": "0130" } }