# Link a document to a business fronting loan or fronting factoring application

Links a document resource to a business fronting loan or fronting factoring application. Use this endpoint to upload the required documents for a fronting loan or fronting factoring, such as signed contracts, credit risk reports, or invoices.  You must add the  and  in the request body. Note that you must make a separate API call for each document.

Endpoint: PUT /v1/businesses/{business_id}/fronting_loan_applications/{application_id}/documents
Version: 1.0

## Path parameters:

  - `business_id` (string, required)
    The ID of the business applying for a fronting loan or fronting factoring.

  - `application_id` (string, required)
    The ID of the business fronting loan or fronting factoring application.

## Request fields (application/json):

  - `document_id` (string, required)
    The unique ID of the document resource.
    Example: "69ec2a9d8dbaf5ea1b13124098a34ea3cdoc"

  - `document_type` (string, required)
    The type of the document.
    Example: "SIGNED_CONTRACT"

## Response 400 fields (application/json):

  - `code` (string)
    Example: "build_pagination_headers_failure"

  - `detail` (string)
    Example: "Cannot connect to database."

  - `id` (string)
    Example: "a95f2aaf-4e0c-4d49-8021-8a16a884ed86"

  - `status` (string)
    Example: "400"

  - `title` (string)
    Example: "Failed to build pagination headers."

## Response 403 fields (application/json):

  - `code` (string)
    Example: "unauthorized_action"

  - `detail` (string)
    Example: "Unauthorized action is not allowed."

  - `id` (string)
    Example: "a95f2aaf-4e0c-4d49-8021-8a16a884ed86"

  - `status` (string)
    Example: "403"

  - `title` (string)
    Example: "Unauthorized Action"

## Response 404 fields (application/json):

  - `code` (string)
    Example: "model_not_found"

  - `detail` (string)
    Example: "Couldn't find 'Account' for id 'DE24112233445566'."

  - `id` (string)
    Example: "a95f2aaf-4e0c-4d49-8021-8a16a884ed86"

  - `status` (string)
    Example: "404"

  - `title` (string)
    Example: "Model Not Found"