Invalid reseller program sections payload
Admin /api/admin/design/pages/reseller/sections rejected the body (400).
Why this happens
Malformed or incomplete sections JSON from the designer — same class of error as Invalid affiliate program sections payload on the affiliate program page.
Diagnose and fix
1. Reload the reseller page designer; undo broken edits.
2. Save again using the UI (avoid hand-crafted API bodies).
3. Check the network response for validation details if present.
4. See Reseller page design.