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

{ "offers": [ { "sales_reference": "001020647201050 ", "seller": { "identifier": "001" } }, { "sales_reference": "001020647201043 ", "seller": { "identifier": "001" } }, { "sales_reference": "001020647201746 ", "seller": { "identifier": "001" } }, { "sales_reference": "001020647201951 ", "seller": { "identifier": "001" } }, { "sales_reference": "001020647200086 ", "seller": { "identifier": "001" } }, { "sales_reference": "001020647200078 ", "seller": { "identifier": "001" } }, { "sales_reference": "001020647201894 ", "seller": { "identifier": "001" } }, { "sales_reference": "001020647200680 ", "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": "001020647201050___,001020647201043___,001020647201746___,001020647201951___,001020647200086___,001020647200078___,001020647201894___,001020647200680___", "delivery_get_method": { "delivery_type": "home_delivery", "center_id": "0130" } }