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

{ "offers": [ { "sales_reference": "001028017100745 ", "seller": { "identifier": "001" } }, { "sales_reference": "001028017204364 ", "seller": { "identifier": "001" } }, { "sales_reference": "001028017101602 ", "seller": { "identifier": "001" } }, { "sales_reference": "001028017102626 ", "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": "001028017100745___,001028017204364___,001028017101602___,001028017102626___", "delivery_get_method": { "delivery_type": "home_delivery", "center_id": "0130" } }