### Transfer N cards from a series

`POST /api/v1/card-batches/{id}/transfer-count`

Like transfer-whole, but moves a count of cards off the top of the available stock rather than the entire series.

- Authentication: manager session (JWT) or API token
- Permission: `prm_cards_change_owner` (Transfer / change card owner)
- Risk: danger
- Rate limit bucket: `t_mutate`
- Idempotent on `request_id`: retrying with the same id returns the original result

#### Parameters

| Name | In | Type | Required | Description |
| --- | --- | --- | --- | --- |
| `id` | path | integer | yes | Series id. |
| `count` | body | integer | yes | How many cards to move. |
| `from_manager_id` | body | integer | yes | The current holder. |
| `to_manager_id` | body | integer | yes | The receiving reseller. |
| `unit_price` | body | number | yes | Price per card. Required, never defaulted to zero. |
| `request_id` | body | string | yes | Idempotency key. |