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

{ "offers": [ { "sales_reference": "001028017202871 ", "seller": { "identifier": "001" } }, { "sales_reference": "001028017202681 ", "seller": { "identifier": "001" } }, { "sales_reference": "001028017202947 ", "seller": { "identifier": "001" } }, { "sales_reference": "001028017206898 ", "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": "001028017202871___,001028017202681___,001028017202947___,001028017206898___", "delivery_get_method": { "delivery_type": "home_delivery", "center_id": "0130" } }