Missing ids query (comma-separated payout request ids)
Admin PayPal payout export required an ids query of comma-separated payout request ids (400).
Why this happens
Export started without selecting payout rows, or the URL lost the ids parameter. Distinct from No matching PayPal payout requests in pending/approved state (ids present, none eligible).
Diagnose and fix
1. Select pending/approved PayPal payout requests in admin, then export again.
2. Do not strip query params from the export URL.
3. Confirm the requests use a PayPal payout method.
4. See Payout requests (approve / reject / paid).