## List Keys

`v1.custom_fields.list_keys(CustomFieldListKeysParams**kwargs)  -> CustomFieldListKeysResponse`

**post** `/v1/customFields/listKeys`

List all active custom field keys, optionally filtered by entity type.

### Parameters

- **next\_page:** `str`

  Cursor that indicates where the next page of results should start.

- **entities:** `List[Literal["alert", "billable_metric", "charge", 15 more]]`

  Optional list of entity types to return keys for

  - `"alert"`

  - `"billable_metric"`

  - `"charge"`

  - `"commit"`

  - `"contract_credit"`

  - `"contract_product"`

  - `"contract"`

  - `"credit_grant"`

  - `"customer_plan"`

  - `"customer"`

  - `"discount"`

  - `"invoice"`

  - `"plan"`

  - `"professional_service"`

  - `"product"`

  - `"rate_card"`

  - `"scheduled_charge"`

  - `"subscription"`

### Returns

- `class CustomFieldListKeysResponse`

  - **data:** `List[Data]`

    - **enforce\_uniqueness:** `bool`

    - **entity:** `Literal["alert", "billable_metric", "charge", 15 more]`

      - `"alert"`

      - `"billable_metric"`

      - `"charge"`

      - `"commit"`

      - `"contract_credit"`

      - `"contract_product"`

      - `"contract"`

      - `"credit_grant"`

      - `"customer_plan"`

      - `"customer"`

      - `"discount"`

      - `"invoice"`

      - `"plan"`

      - `"professional_service"`

      - `"product"`

      - `"rate_card"`

      - `"scheduled_charge"`

      - `"subscription"`

    - **key:** `str`

  - **next\_page:** `Optional[str]`

### Example

```python
from metronome import Metronome

client = Metronome(
    bearer_token="My Bearer Token",
)
response = client.v1.custom_fields.list_keys(
    entities=["customer"],
)
print(response.data)
```