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

{ "offers": [ { "sales_reference": "001018915300091 ", "seller": { "identifier": "001" } }, { "sales_reference": "001018916700349 ", "seller": { "identifier": "001" } }, { "sales_reference": "001018920900166 ", "seller": { "identifier": "001" } }, { "sales_reference": "001018918600257 ", "seller": { "identifier": "001" } }, { "sales_reference": "001018958300578 ", "seller": { "identifier": "001" } }, { "sales_reference": "001018958300214 ", "seller": { "identifier": "001" } } ], "subsite": { "identifier": "supermarketExpressStore", "parent": { "identifier": "supermarket" } }, "query_params": { "centers": {}, "is_full_documentation": false, "is_include_offer_availability": true }, "query_list_get_method": "001018915300091___,001018916700349___,001018920900166___,001018918600257___,001018958300578___,001018958300214___", "delivery_get_method": { "delivery_type": "eci_express", "center_id": "0006" } }