> ## Documentation Index > Fetch the complete documentation index at: https://docs.fastcac.com/llms.txt > Use this file to discover all available pages before exploring further. # List documents ## OpenAPI ````yaml /openapi.json get /registrations/{registration_id}/documents openapi: 3.1.0 info: title: FastCAC API description: Register Nigerian businesses with CAC from your own product. version: '2026-11-01' servers: - url: https://api.fastcac.com/v1 security: - apiKey: [] tags: - name: Account description: Check your key and see your organization. - name: Name checks description: >- Check a business name against CAC's rules and registry before registering it. - name: Registrations description: Register a Business Name with CAC, from draft to certificate. - name: Test helpers description: 'Test keys only: move a registration on without waiting.' - name: Webhooks description: Endpoints that receive events, and the events sent to them. - name: Webhook events description: What FastCAC POSTs to your webhook endpoints. paths: /registrations/{registration_id}/documents: get: tags: - Registrations summary: List documents operationId: list_documents_registrations__registration_id__documents_get parameters: - name: registration_id in: path required: true schema: type: string title: Registration Id responses: '200': description: Successful Response content: application/json: schema: $ref: '#/components/schemas/V1DocumentList' examples: Example: value: object: list data: - object: document id: doc_0jd3TbM5Wc0AkCGZSKYBKn registration_id: reg_4kMzPP2CrSMnY18kiANzau proprietor: 0 kind: means_of_id filename: means_of_id.jpg content_type: image/jpeg size: 8 status: verified reason: null created_at: '2026-10-23T22:17:57Z' - object: document id: doc_2rd5SWxBhoQGhKZjWBxIWb registration_id: reg_4kMzPP2CrSMnY18kiANzau proprietor: 0 kind: passport filename: passport.jpg content_type: image/jpeg size: 8 status: verified reason: null created_at: '2026-10-23T22:17:57Z' - object: document id: doc_3g6EJYHVKNTzECvBQ3w6lL registration_id: reg_4kMzPP2CrSMnY18kiANzau proprietor: 0 kind: signature filename: signature.jpg content_type: image/jpeg size: 8 status: verified reason: null created_at: '2026-10-23T22:17:57Z' has_more: false '400': description: The request is invalid; `param` names the field. content: application/json: schema: $ref: '#/components/schemas/Error' '401': description: The API key is missing, malformed, revoked or expired. content: application/json: schema: $ref: '#/components/schemas/Error' examples: Example: value: error: type: authentication_error code: api_key_missing message: 'Send your API key as `Authorization: Bearer `.' param: null request_id: req_kdwpKsFMKS4VzLjqZJ0ntdrl '403': description: >- The key can't do this (for example, live registrations before they open). content: application/json: schema: $ref: '#/components/schemas/Error' examples: Example: value: error: type: permission_error code: live_mode_unavailable message: >- Live registrations aren't open yet. Use a test key (fc_test_…) for now. param: null request_id: req_oYVCIHqeYbgIA3lIzwG0PO5r '404': description: No such object for this key's organization and mode. content: application/json: schema: $ref: '#/components/schemas/Error' examples: Example: value: error: type: not_found_error code: resource_missing message: 'No such registration: reg_0000000000000000000000.' param: id request_id: req_RlcFqswqrJZos4pnRMH3wa8d '409': description: >- The object's state doesn't allow this, or the Idempotency-Key was reused. content: application/json: schema: $ref: '#/components/schemas/Error' '429': description: Too many requests; wait for `Retry-After` seconds. content: application/json: schema: $ref: '#/components/schemas/Error' components: schemas: V1DocumentList: properties: object: type: string const: list title: Object default: list data: items: $ref: '#/components/schemas/V1Document' type: array title: Data has_more: type: boolean title: Has More type: object required: - data - has_more title: V1DocumentList Error: properties: error: $ref: '#/components/schemas/ErrorDetail' required: - error title: V1Error type: object V1Document: properties: object: type: string const: document title: Object default: document id: type: string title: Id description: doc_… registration_id: type: string title: Registration Id proprietor: type: integer title: Proprietor description: Index of the proprietor in `proprietors`. kind: type: string enum: - means_of_id - passport - signature - supporting_document title: Kind filename: type: string title: Filename content_type: anyOf: - type: string - type: 'null' title: Content Type size: type: integer title: Size description: Bytes. status: type: string enum: - verified - rejected title: Status reason: anyOf: - type: string - type: 'null' title: Reason description: Why it was rejected. created_at: anyOf: - type: string - type: 'null' title: Created At type: object required: - id - registration_id - proprietor - kind - filename - content_type - size - status - reason - created_at title: V1Document ErrorDetail: properties: type: enum: - invalid_request_error - authentication_error - permission_error - idempotency_error - rate_limit_error - api_error title: Type type: string code: description: Stable and machine-readable, e.g. registration_incomplete. title: Code type: string message: description: For a developer to read; may change. title: Message type: string param: anyOf: - type: string - type: 'null' description: The parameter at fault, as a path like proprietors[0].nin. title: Param request_id: anyOf: - type: string - type: 'null' description: Also in the FastCAC-Request-Id header. Quote it to support. title: Request Id required: - type - code - message - param - request_id title: ErrorDetail type: object securitySchemes: apiKey: type: http scheme: bearer description: 'Your secret API key: fc_test_… in test mode, fc_live_… in live mode.' ```` This documentation is built and hosted on [Mintlify](https://mintlify.com), a developer documentation platform.