Generate completion certificates and evidence packages for accepted documents

[jusso-dev]

Context

ScopeStack records audit logs and acceptance metadata, but mature e-signature tools provide a clear completion certificate/evidence package that can be downloaded and retained with the signed document.

Goal

Generate a completion certificate for accepted documents that summarizes signer identity, timestamps, audit events, document version, and integrity details.

Scope

• Add a downloadable certificate PDF or appended evidence section.
• Include:
  • Document title/reference/version.
  • Organisation and client.
  • Recipient names/emails/roles.
  • Sent/viewed/accepted/declined timestamps.
  • IP address and user agent for key events where available.
  • Signature type and accepted signature value/image.
  • Completed signer fields once signer fields exist.
  • Audit event timeline.
  • Document hash or rendered PDF hash for integrity.
• Expose certificate download from document detail and client portal after completion.

UX Notes

• Label it clearly: "Completion certificate" or "Evidence certificate".
• Keep the certificate sober and legal/compliance oriented.
• Include a short explanation that it records the signing and acceptance history.

Data/Architecture Notes

• Use existing Acceptance, AuditLog, DocumentRecipient, and rendered PDF data.
• Add a hash utility for final document content/PDF bytes.
• Consider storing the generated certificate or generating on demand.

Acceptance Criteria

• Accepted documents have a completion certificate download.
• Certificate includes signer and event evidence.
• Certificate includes document version/reference and integrity hash.
• Certificate generation is covered by tests for required fields.
• Certificate remains available after document is locked.

Dependencies

• Signer fields should feed into the certificate when available.
• Correct/void/reassign events should appear in the certificate timeline.

Priority

P1. Important for trust, compliance, and customer confidence.