About filter parameter.

Format: filter[range]=new_season,sale&filter[size]=98

The filters are unique and generated for you q parameter, then returned right in the response, the key is facets. For example, you search for “black dress” and need to filter by “Style”, when you check the response pay attention at “facets” here you can see array with "id":"attribute_1046" and "name":"Style", next check "facetValues" for this array. In this data you can see an array with "id":"62000" and "name":"Backless". So your filter will be: filter[attribute_1046]=62000 . If you need more styles just add a new id by comma filter[attribute_1046]=62000,8314 (“id”:“8314” -> “name”:“A Line”). Also you can add a new filter attribute (“id”:“attribute_10155” -> “name”:“Body Fit”) filter[attribute_1046]=62000,8314&filter[attribute_10155]=6764