> ## 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

**authorization** `string` *required*

Your API key for authentication.

### Body (Multipart Form Data)

**file** `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.

### Response

**document\_sid** `string`

A unique document identifier to reference when initiating the port request.

```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"
```

```json Response theme={null}
{
  "data": {
    "document_sid": "doc_abc123"
  },
  "errors": null
}
```

***

Docs for agents: [llms.txt](https://docs.bland.ai/llms.txt)


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