> ## Documentation Index
> Fetch the complete documentation index at: https://docs.fluz.app/llms.txt
> Use this file to discover all available pages before exploring further.
# Submit Business Documents
> Upload supporting documentation for a business account — at registration for sole proprietorships, or when KYB review requests more information.
## Overview
Business documents are submitted over a **REST file-upload endpoint**, not through the GraphQL API. The endpoint stores the file and returns a URL that you then reference from a GraphQL mutation or hand to your account manager.
There are two moments in a business lifecycle where documents come into play:
| Situation | What to do |
| ------------------------------------------------ | ------------------------------------------------------------------------------------------------------------------------------------------------------------ |
| Registering a **sole proprietorship** | Upload the document **before** calling `registerBusiness`, then pass the returned URL in `soleProprietorshipDocumentUrl`. Registration will fail without it. |
| KYB review requests **additional documentation** | The account stays in `PENDING`. Upload the requested files and provide the URLs to your account manager along with the `accountId`. |
LLCs, corporations, partnerships, and co-ops do **not** require any document upload at registration. Fluz verifies those entities from the data submitted in [registerBusiness](/business-registration). Documents are only requested if the automated checks do not clear.
***
## Upload endpoint
| Property | Value |
| -------------- | -------------------------------------------------- |
| Method | `POST` |
| Path | `/api/v1/file-upload/sole-proprietorship-document` |
| Content type | `multipart/form-data` |
| Form field | `file` |
| Authentication | OAuth Bearer Token |
Staging base URL: `https://transactional-graph.staging.fluzapp.com`
```bash theme={null}
curl -X POST https://transactional-graph.staging.fluzapp.com/api/v1/file-upload/sole-proprietorship-document \
-H "Authorization: Bearer " \
-F "file=@/path/to/document.pdf"
```
The endpoint returns a URL. Store it and pass it straight through to `registerBusiness`:
```json theme={null}
{
"input": {
"businessName": "Jane Doe Design",
"businessStructure": "SOLE_PROPRIETORSHIP",
"soleProprietorshipDocumentUrl": "",
"...": "..."
}
}
```
Upload first, register second. There is no way to attach a document to an existing registration — if you submit a sole proprietorship without `soleProprietorshipDocumentUrl`, the mutation is rejected, and the user cannot start a second application until the first one closes (`BS-0007`).
**File requirements** — accepted formats, maximum file size, and page limits: confirm current limits with your account manager before building client-side validation.
***
## Sole proprietorship documents
Because a sole proprietorship is not a separately registered legal entity, the document needs to establish two things: that the trade name exists, and that the proprietor is the person behind it.
Documents that generally satisfy this:
* **Fictitious business name / DBA filing** — the county or state filing for the trade name
* **Business license** — issued to the proprietor by the city, county, or state
* **IRS EIN assignment letter** (CP 575 or 147C) — where the sole proprietorship holds its own EIN
Practical guidance:
* The name on the document should match the `businessName` you submit. A mismatch is the most common reason a sole proprietorship review stalls.
* Submit a full, legible scan or PDF of the whole document, not a cropped screenshot of one line.
* Expired licenses and filings are not accepted — the document should be current.
## Additional documentation during KYB review
If Fluz compliance needs more than the registration payload provides, the KYB case stays `PENDING` while the request is made through your account manager. Commonly requested items:
* Formation documents (articles of organization or incorporation, operating agreement, partnership agreement)
* Proof of the business address
* Government-issued ID for a beneficial owner or control person
* An explanation or supporting detail on the nature of the business, where `natureOfBusiness` was left blank or was too general
What to do on your side:
1. Keep the account in an "under review" state in your UI. Do not resubmit `registerBusiness` — a second application is blocked by `BS-0007`, and duplicate cases slow the review down.
2. Upload the requested files and send the URLs plus the `accountId` to your account manager.
3. Poll the business account status on a low-frequency schedule and update your UI when it moves to approved or declined. See [KYB status lifecycle](/business-registration#kyb-status-lifecycle).
Submitting complete beneficial ownership information at registration is the single most effective way to avoid a document request. See [Beneficial ownership requirements](/business-registration#beneficial-ownership-requirements).
## Related pages
The `registerBusiness` mutation, parameters, and error codes.
Fetch the category and sub-category IDs required at registration.
Identity verification for the individual owners behind the business.
Base URLs for the upload endpoint in each environment.