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OpenAPI Specification

openapi: 3.2.0
info:
  title: FreeSign — Free e-signature Consent API
  version: 0.0.0
  summary: Free e-signature (electronic signature) API — zero-document PDF signing.
  description: FreeSign is a free e-signature (electronic signature, esignature) service. The API accepts hashes, OTP state, signatures, and receipts only. Do not upload PDF bytes. Browser/headless clients compute hashes and generate signatures locally. Output is a standard PAdES-B-T signed PDF, designed for the EU eIDAS Advanced Electronic Signature (AES, Article 26) and US ESIGN/UETA evidence models — legal admissibility is jurisdiction- and fact-specific.
servers:
- url: https://free-sign.com
  description: Production
- url: http://localhost:8787
  description: Local development
tags:
- name: Consent
paths:
  /api/consent:
    get:
      summary: Fetch current consent text and public ceremony configuration
      description: Single source of truth for the consent version/text the browser signs. Also returns enabled signature variants and the public Cloudflare Turnstile site key when configured. No PDF bytes are involved.
      responses:
        '200':
          description: Consent text, hash, signature variants, and public Turnstile site key.
          content:
            application/json:
              schema:
                type: object
                properties:
                  version:
                    type: string
                  text:
                    type: string
                  text_sha256:
                    type: string
                    pattern: ^[a-f0-9]{64}$
                  signature_variants:
                    type: array
                    items:
                      type: string
                      enum:
                      - signer_certificate
                      - freesign_verified_seal
                  turnstile_site_key:
                    type: string
                  intelligence:
                    type: object
                    description: Present only on deployments with ENABLE_DOCUMENT_INTELLIGENCE=true (the optional in-browser one-paragraph PDF summary POC). Absent when the flag is off — clients must treat the field as flag-conditional, not required.
                    properties:
                      enabled:
                        type: boolean
                      free_quota_per_30d:
                        type: integer
                        minimum: 0
                        description: Per-deployment free quota label (informational only — not enforced in code today).
                    required:
                    - enabled
                    - free_quota_per_30d
                required:
                - version
                - text
                - text_sha256
                - signature_variants
                - turnstile_site_key
      tags:
      - Consent
      operationId: getApiConsent
      x-operation-id-source: derived