Query cash statements and position statements. Both use GET query parameters, default to the current trade date, and support pagination with page (default 1) and pageSize (default 20, maximum 100).
Both statement endpoints use code: 0 for success and return records in data.statements. Validation errors return HTTP 400 with 110011 (date format), 110012 (reversed date range), or 110013 (page size above 100).