Queries vouchers with filtering, sorting, and pagination.

The 1-based page index.

The number of items per page.

Sort fields. Prefix with - for descending order (e.g. -created_at).

Filter by organization_id.

Filter by status.

Filter by source.

Filter by expires_at.

Filter by issued_at.

How to combine the field filters: "and" (default) requires every filter to match, "or" requires any of them to match.