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Live API contract
API REFERENCE / Prefill links

Create a prefilled signing link

POST/v1/prefill-links

Mints a single-use link that opens the template's public signing page with values already filled in. The signer can change anything that was filled in for them; nothing is locked. values is validated against the template's active version with the same per-field rules a submission gets, minus required. a prefill is partial by design. and signature, initials, and photo/ID capture blocks are never prefillable. The waiver produced by the link is sourced prefill and carries tags. Defaults to expiring in 72 hours; 720 (30 days) is the maximum.

Authentication

Send an organization-scoped API key in the Authorization header. Keep credentials on your server.

prefill:write
Authentication and API keys →

Request body

Use application/json. Replace example identifiers and values with data from your organization.

templateIdstring · uuidrequired
valuesobjectrequired
tagsarray
expiresInHoursinteger

Range: 1 to 720.

Responses

201 Response schema

application/json

idstring · uuidrequired
urlstringrequired
expiresAtstring · date-timerequired
View complete response schema
HTTP 201 schema
{
  "type": "object",
  "properties": {
    "id": {
      "type": "string",
      "format": "uuid",
      "pattern": "^([0-9a-fA-F]{8}-[0-9a-fA-F]{4}-[1-8][0-9a-fA-F]{3}-[89abAB][0-9a-fA-F]{3}-[0-9a-fA-F]{12}|00000000-0000-0000-0000-000000000000)$"
    },
    "url": {
      "type": "string"
    },
    "expiresAt": {
      "type": "string",
      "format": "date-time"
    }
  },
  "required": [
    "id",
    "url",
    "expiresAt"
  ],
  "additionalProperties": false
}

401 Response schema

application/json

errorobjectrequired
View nested fields
codestringrequired
messagestringrequired
requestIdstringrequired
detailsvalue
View complete response schema
HTTP 401 schema
{
  "type": "object",
  "properties": {
    "error": {
      "type": "object",
      "properties": {
        "code": {
          "type": "string"
        },
        "message": {
          "type": "string"
        },
        "requestId": {
          "type": "string"
        },
        "details": {}
      },
      "required": [
        "code",
        "message",
        "requestId"
      ],
      "additionalProperties": false
    }
  },
  "required": [
    "error"
  ],
  "additionalProperties": false
}

403 Response schema

application/json

errorobjectrequired
View nested fields
codestringrequired
messagestringrequired
requestIdstringrequired
detailsvalue
View complete response schema
HTTP 403 schema
{
  "type": "object",
  "properties": {
    "error": {
      "type": "object",
      "properties": {
        "code": {
          "type": "string"
        },
        "message": {
          "type": "string"
        },
        "requestId": {
          "type": "string"
        },
        "details": {}
      },
      "required": [
        "code",
        "message",
        "requestId"
      ],
      "additionalProperties": false
    }
  },
  "required": [
    "error"
  ],
  "additionalProperties": false
}

404 Response schema

application/json

errorobjectrequired
View nested fields
codestringrequired
messagestringrequired
requestIdstringrequired
detailsvalue
View complete response schema
HTTP 404 schema
{
  "type": "object",
  "properties": {
    "error": {
      "type": "object",
      "properties": {
        "code": {
          "type": "string"
        },
        "message": {
          "type": "string"
        },
        "requestId": {
          "type": "string"
        },
        "details": {}
      },
      "required": [
        "code",
        "message",
        "requestId"
      ],
      "additionalProperties": false
    }
  },
  "required": [
    "error"
  ],
  "additionalProperties": false
}

422 Response schema

application/json

errorobjectrequired
View nested fields
codestringrequired
messagestringrequired
requestIdstringrequired
detailsvalue
View complete response schema
HTTP 422 schema
{
  "type": "object",
  "properties": {
    "error": {
      "type": "object",
      "properties": {
        "code": {
          "type": "string"
        },
        "message": {
          "type": "string"
        },
        "requestId": {
          "type": "string"
        },
        "details": {}
      },
      "required": [
        "code",
        "message",
        "requestId"
      ],
      "additionalProperties": false
    }
  },
  "required": [
    "error"
  ],
  "additionalProperties": false
}

429 Response schema

application/json

errorobjectrequired
View nested fields
codestringrequired
messagestringrequired
requestIdstringrequired
detailsvalue
View complete response schema
HTTP 429 schema
{
  "type": "object",
  "properties": {
    "error": {
      "type": "object",
      "properties": {
        "code": {
          "type": "string"
        },
        "message": {
          "type": "string"
        },
        "requestId": {
          "type": "string"
        },
        "details": {}
      },
      "required": [
        "code",
        "message",
        "requestId"
      ],
      "additionalProperties": false
    }
  },
  "required": [
    "error"
  ],
  "additionalProperties": false
}

Authentication and validation failures use the shared error envelope. Save the request ID when diagnosing a failed call.

Build the surrounding workflow

Read the prefill links guide for ordering, verification and recovery. Browse the other prefill links endpoints when you need the next operation.