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

{ "offers": [ { "sales_reference": "001020604603785 ", "seller": { "identifier": "001" } }, { "sales_reference": "001020604605079 ", "seller": { "identifier": "001" } }, { "sales_reference": "001020604605087 ", "seller": { "identifier": "001" } }, { "sales_reference": "001020604603744 ", "seller": { "identifier": "001" } }, { "sales_reference": "001020604603769 ", "seller": { "identifier": "001" } }, { "sales_reference": "001020604603777 ", "seller": { "identifier": "001" } }, { "sales_reference": "001020604603793 ", "seller": { "identifier": "001" } }, { "sales_reference": "001020604603801 ", "seller": { "identifier": "001" } }, { "sales_reference": "001020604605277 ", "seller": { "identifier": "001" } }, { "sales_reference": "001020604603751 ", "seller": { "identifier": "001" } }, { "sales_reference": "001020604604585 ", "seller": { "identifier": "001" } }, { "sales_reference": "001020604605426 ", "seller": { "identifier": "001" } }, { "sales_reference": "001020605100583 ", "seller": { "identifier": "001" } }, { "sales_reference": "001020604605665 ", "seller": { "identifier": "001" } }, { "sales_reference": "001020605100823 ", "seller": { "identifier": "001" } }, { "sales_reference": "001020605101383 ", "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": "001020604603785___,001020604605079___,001020604605087___,001020604603744___,001020604603769___,001020604603777___,001020604603793___,001020604603801___,001020604605277___,001020604603751___,001020604604585___,001020604605426___,001020605100583___,001020604605665___,001020605100823___,001020605101383___", "delivery_get_method": { "delivery_type": "home_delivery", "center_id": "0130" } }