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

# Upload Port Document

> Upload a Letter of Authorization (LOA) or proof of ownership document for number porting.

### Headers

<ParamField header="authorization" type="string" required>
  Your API key for authentication.
</ParamField>

### Body (Multipart Form Data)

<ParamField body="file" type="file" required>
  The document file to upload. Accepted formats: PDF, JPEG, PNG, GIF, WebP. Maximum file size: 10MB.

  This should be a utility bill or carrier invoice dated within the last 30 days that shows the account name, owner/authorized user name, and service address.
</ParamField>

### Response

<ResponseField name="document_sid" type="string">
  A unique document identifier to reference when initiating the port request.
</ResponseField>

```bash Example Request theme={null}
curl -X POST https://api.bland.ai/v1/sip/port/document \
  -H "Authorization: Bearer <token>" \
  -F "file=@/path/to/utility-bill.pdf"
```

<ResponseExample>
  ```json Response theme={null}
  {
    "data": {
      "document_sid": "doc_abc123"
    },
    "errors": null
  }
  ```
</ResponseExample>

***

Docs for agents: [llms.txt](/llms.txt)