> ## Documentation Index
> Fetch the complete documentation index at: https://developers.myhero.so/llms.txt
> Use this file to discover all available pages before exploring further.

# Open a signing session

> Public.

Opens the document from its emailed link — recorded as opened and verified — and returns a session token for the signature-guest-token header, valid for an hour, that opens the signer's portal for the project — or, with the portal off, only this document's envelope.



## OpenAPI

````yaml post /signature/guest/{token}/verify
openapi: 3.1.0
info:
  title: HERO API
  version: current
  description: |-
    The HERO REST API.

    See https://developers.myhero.so for the rendered docs.
servers:
  - url: https://app.myhero.so
security: []
paths:
  /signature/guest/{token}/verify:
    post:
      tags:
        - Signatures
      summary: Open a signing session
      description: >-
        Public.


        Opens the document from its emailed link — recorded as opened and
        verified — and returns a session token for the signature-guest-token
        header, valid for an hour, that opens the signer's portal for the
        project — or, with the portal off, only this document's envelope.
      operationId: verifySignatureGuest
      parameters:
        - schema:
            type: string
            minLength: 16
          required: true
          name: token
          in: path
      responses:
        '200':
          description: 200 response
          content:
            application/json:
              schema:
                type: object
                properties:
                  data:
                    type: object
                    properties:
                      token:
                        type: string
                      projectId:
                        type: string
                      requestId:
                        type: string
                      kept:
                        type: boolean
                    required:
                      - token
                      - projectId
                      - requestId
                      - kept
                required:
                  - data
        '410':
          description: 410 response
          content:
            application/json:
              schema:
                type: object
                properties:
                  error:
                    type: string
                    description: |-
                      Error class name (e.g.

                      ValidationError, NotFound)
                  message:
                    type: string
                    description: Human-readable error message
                  details:
                    type: array
                    items: {}
                required:
                  - error
                  - message
      security: []

````

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