Include a Status to filter your Memberships (50 = prospective, 75 = pending, 100 = active, 300 = expired, 350 = canceled). You can retrieve multiple statuses at once: "status=50,75,100"

Filter by a specific email address (looks for exact matches on email, not a search/partial function)

Filter by a specific "_id" (the internal unique record identifier within Join It)

Filter by a specific "external_id" (the ID that's optionally assigned by an Organization)

Filter by including the IDs of specific Membership Types. You can retrieve the Memberships which belong to multiple Membership Types by including a string of comma separated values (e.g. xxxxxx,yyyyyy,zzzzzz)