The filter parameter applies a faceted filter to the returned products, searching for products that fit your parameter values. Any facet that you want to filter must be in your feed.
Attributes must be enabled and mapped by Bloomreach. Let your Bloomreach representative know which attributes in your content feed you want to apply as filters to search results.
You can filter results based on numeric ranges.
For example, &filter=(price:["100" TO "*"]).
Please note that a negative filter on ranges is not supported.
To provide multiple filters, send multiple filter parameters. For example, &filter=(price:["*" TO "100"])&filter=(color_groups: ("blue"))