Returns a workspace's contacts, filtered, searched, sorted and counted on the server. Requires the Contacts entitlement (403 without it). Session cookie, x-api-key, or a Bearer token.

Attribute filters use filter[attribute.<key>][<operator>]=<value>, where <key> is a ContactAttributeKeyResource.key of the workspace (an unknown key → 400). The operators depend on the key's dataType; an operator the type does not support → 400:

Text comparisons are case-insensitive. in matches any of its values: repeat the key once per value (filter[attribute.plan][in]=Pro&filter[attribute.plan][in]=Team). String values are taken verbatim — never split on commas, since a value can contain one; a number in also accepts comma-separated values. ne, contains, notContains, startsWith and endsWith may also be repeated, and then every value must hold (AND). Every other operator takes exactly one value (repeating it → 400). isSet / isNotSet ignore their value (send true). A value is set when the attribute row exists and carries a value (non-empty text, or a non-null number/date). ne and notContains match only contacts whose value is set and differs — use isNotSet for contacts without one. All filters combine with AND. At most 50 distinct filter parameters per request and at most 100 values per in.

The cursor is bound to sortBy and to the search and filter set; changing any of them while paging → 400 naming cursor. Unknown query parameters → 400.