Digital approval chains with conditional routing based on document type, extracted value, jurisdiction, risk level, or any other field the document extraction layer provides, replacing the informal email chain that loses track of who approved what and when. Workflow engine built on configurable state machines: each document type has a named workflow definition that specifies states (Submitted, Under Review, Approved, Rejected, Signed, Archived), transitions between states, the actor or role responsible for each transition, and the conditions that determine routing branches. Routing rules example: a purchase order with extracted value above $50,000 routes to department head then CFO for dual sign-off; a purchase order below $10,000 routes to department head only; a purchase order with a new supplier routes through vendor onboarding before the standard approval chain regardless of value. Approval actions via web interface, email deep link, or Slack message, approvers click Approve or Reject from wherever they are without logging into a separate system. DocuSign, Adobe Acrobat Sign, and HelloSign integration for legally binding digital signature collection: envelope creation via API, signatory order enforcement (counterparty cannot sign before internal approval completes), signature completion webhook triggering the next workflow state, and signed document stored with the full audit trail. Reminder escalation: configurable reminder emails sent 48 hours before an approval deadline, 24 hours before, and on the deadline day; unresponded approvals escalated to the approver's manager after the configurable deadline passes. Audit log capturing every action with actor identity, timestamp, IP address, and the document state before and after the action, a complete chain of custody record for compliance and dispute purposes.