Returns a paginated list of contacts in the workspace, newest first. Look up a single contact by its exact `email` or `external_id`, or search by email substring with `q`. Return the contact with exactly this email address (case-insensitive). Email is unique within a workspace, so this matches at most one contact. Return the contact with exactly this external_id (your own identifier for the contact). Unique within a workspace, so this matches at most one contact. Case-insensitive substring match against the contact's email address. Maximum number of items to return per page. Cursor from the `next_cursor` field of a previous list response. Returns items immediately after the cursor position in the current sort order. Cursor from the `prev_cursor` field of a previous list response. Returns items immediately before the cursor position in the current sort order. Page of contact objects. ID of the contact (`con_`-prefixed), accepted by every operation that takes a `contact_id`. The contact's email address, stored trimmed and lowercased. Unique within the workspace. The contact's first name. Available in broadcast templates as the `contact.first_name` variable. The contact's last name. Available in broadcast templates as the `contact.last_name` variable. Your own identifier for this contact, such as a user ID in your system. Unique within the workspace when set. Custom property values for this contact, available as template variables in broadcasts. Each key is a property created via the contact properties API, and each value is a string, number, or boolean matching the property's declared type (strings up to 500 characters). Total size is capped at 2 KB serialized. Values stored under a property that was later archived remain readable here. Channels this contact can be reached on, derived from the identifiers it has. A contact with an email address includes `email`. More values are added as a contact gains identifiers for other channels. Cursor for the next page. Pass back as `starting_after` to advance forward. Null when no next page exists. Cursor for the previous page. Pass back as `ending_before` to step backward. Null when no previous page exists. Refresh anchor. Pass back as `ending_before` later to fetch items that have appeared since this response. Non-null whenever `data` is non-empty; null only on an empty page. Distinct from `prev_cursor`.