items and pagination.
page is one-based. pageSize is capped at 100. Continue while hasNext is true; do not infer the next page solely from the number of returned items.
Customers and accounts
Customer and account lists use field operators in the query key:eq, ne, gt, gte, lt, lte, in, contains, and isNull, but each field exposes only its allowed subset. Omitting an operator means eq when equality is supported. Up to three comma-separated sort fields are accepted; prefix a field with - for descending order.
Unknown fields, unsupported operators, and invalid values return validation_failed. Filters are never silently ignored.