---
title: "Create a registration attachment"
canonical: "https://bird.com/docs/api/reference/create-compliance-attachment"
---

# Create a registration attachment

`POST /v1/compliance/attachments`

Uploads a document that answers a compliance requirement, such as the proof
of address a country asks for before it approves a number. Send the file as a
`multipart/form-data` body with the bytes in a `file` part.

A requirement whose `data_type` is `document` is answered with attachment IDs
rather than a typed value. Pass the returned ID as the answer's
`attachment_id`, or in its `attachment_ids` where the requirement accepts
several. Upload before you file the submission that cites the attachment. An
unused attachment expires after seven days. After a submission cites it, the
attachment no longer expires and you can reuse it elsewhere in the workspace,
including as evidence for a 10DLC registration. Toll-free verification
evidence must be a PNG or JPEG image.

PNG, JPEG, and PDF files up to 10 MB are accepted. Uploading a file whose
contents match an existing attachment returns that attachment instead of
creating a duplicate.

## Code samples

**TypeScript**

```ts
import { readFile } from "node:fs/promises";

const attachment = await bird.complianceAttachments.create({
  file: new Blob([await readFile("proof-of-address.pdf")]),
  filename: "proof-of-address.pdf",
  description: "Utility bill for the registered address",
});
// Cite this id as the answer's attachment_id in a submission.
console.log(attachment.id, attachment.content_type);
```

Examples: [TypeScript](/docs/api/reference/create-compliance-attachment.ts.md) · [Python](/docs/api/reference/create-compliance-attachment.py.md) · [Go](/docs/api/reference/create-compliance-attachment.go.md) · [PHP](/docs/api/reference/create-compliance-attachment.php.md) · [CLI](/docs/api/reference/create-compliance-attachment.cli.md) · [cURL](/docs/api/reference/create-compliance-attachment.curl.md)

## Example response `200`

```json
{
  "created_at": "2026-05-20T09:14:52Z",
  "updated_at": "2026-05-25T16:42:01Z",
  "id": "tca_01krdgeqcxet5s7t44vh8rt9mg",
  "status": "draft"
}
```

## Response body

- `created_at` (string, required)
- `updated_at` (string, required)
- `id` (string, required)
- `filename` (string, required): The uploaded file's name.
- `content_type` (string, required): The file's content type, determined from its contents.
- `size_bytes` (integer, required): The file's size in bytes.
- `description` (string): A short note describing what the file shows.
- `status` (string, required)

  Lifecycle of an attachment. `draft` is a file that has been uploaded but nothing
  has been registered or submitted with it yet, and it is discarded at its
  `expires_at`. `attached` means at least one registration has cited it, so it is
  kept permanently and can no longer be deleted.

  Possible values: `draft`, `attached`
- `download_url` (string, required): Short-lived signed URL for downloading or previewing the attachment. Valid for 24 hours from when the resource was fetched; request a fresh resource to obtain a new URL after expiry. Do not cache beyond `download_url_expires_at`. Registration authorities (10DLC and toll-free carriers) retrieve evidence via a separate, longer-lived token; this URL is not that token.
- `preview_url` (string): Optional signed URL for inline viewing on an isolated storage origin. Valid for one hour; fetch the attachment again to refresh it.
- `download_url_expires_at` (string, required): When `download_url` expires. Both fields are always present; the server returns an error rather than omitting them.
- `expires_at` (nullable string, required): When this attachment is discarded if nothing is registered or submitted with it. Null once its status is `attached`.

## Related resources

- [Should I use a Bird SDK or call the API directly?](/explained/platform/should-i-use-an-sdk-or-call-the-api-directly) (answer)
- [Build your first integration](/learn/paths/integration) (course)
- [Send your first email](/docs/get-started/send-your-first-email) (docs)

[Get an implementation brief](/learn/workspace?topic=api-basics)