Search, inspect, and manage vendor bills and invoices. Use when:
'find a bill', 'show me pending bills', 'bill details', 'look up a bill',
'draft bill details', 'bill attachments', 'what bills need my approval'.
Do NOT use for: approving bills (use ramp-approval-dashboard), uploading vendor
documents (use ramp-manage-vendors), or card transaction management
(use ramp-complete-expenses).
