When listing resources in a collection you can filter results by specifying search conditions as query parameters in the URL. For example, to search person by email address you can use this:

GET /v1/people?

You can specify multiple search criteria and they will be combined using "AND" logic. For example, to find past clients that came from Zillow use this request:

GET /v1/people?stage=Past%20Client&source=Zillow