# Update a custom field definition

Endpoint: PATCH /custom-field-definitions/{customFieldDefinitionId}
Version: 1.44
Security: bearerAuth

## Path parameters:

  - `customFieldDefinitionId` (integer, required)
    Custom field definition identifier
    Example: 1

## Request fields (application/json-patch+json):

  - `op` (string, required)
    The JSON Patch operation to be performed
    Enum: "add", "remove", "replace", "move", "copy", "test"

  - `path` (string, required)
    A JSON-Pointer

  - `value` (object)
    The value to be used within the operations

  - `from` (string)
    A string containing a JSON Pointer value

## Response 200 fields (application/json):

  - `id` (integer)
    Unique identifier for the custom field definition
    Example: 1

  - `label` (string, required)
    Display label for the custom field
    Example: "Additional field definition label"

  - `entityLevel` (string, required)
    Indicates the entity level the custom field applies to
    Enum: "USAGE_PRODUCT", "RENTAL_PRODUCT", "RENTAL_PRODUCT_INVENTORY", "SITE", "CUSTOMER"


## Response 400 fields

## Response 404 fields