Query the payer-seat billing-document search rows ("what I owe") — the mirror of /search/invoice-rows, recreating legacy /search/invoice-row as seen from the client seat. Identical execution model: every filter runs inside the Atlas $search pipeline; relevance sort when filter[searchString][eq] is present; otherwise default sort is dueDate descending. Rows include documents the Payable resource does not serve: payroll batch invoices (metadata.invoiceType = approvedInvoicesPayment, served on V3 as a PayrollRun) and personal-paylink invoices (metadata.creationSource = personalPaylink). Both are excluded from /v3/payments/payables list results and 404 on a per-id read, so a surface mirroring the payables list should exclude them here too — filter[metadata.invoiceType][ne]=approvedInvoicesPayment and filter[metadata.creationSource][ne]=personalPaylink, the legacy /search/invoice-row base filter. Account scope is enforced server-side (no filter[accountIds] — target a child account via X-Wingspan-Account).