### Create an invoice for a subscriber

`POST /api/v1/users/{id}/invoices`

The per-subscriber form of issuing an invoice. Same validation and the same server-computed total; the subscriber comes from the path rather than the body.

- Authentication: manager session (JWT) or API token
- Permission: `prm_users_invoices_create` (Create user invoices)
- Risk: write
- Rate limit bucket: `t_mutate`

#### Parameters

| Name | In | Type | Required | Description |
| --- | --- | --- | --- | --- |
| `id` | path | integer | yes | Subscriber id. |
| `items` | body | array | yes | At least one line item. |