# Create a new custom field definition

Endpoint: POST /custom-field-definitions
Version: 1.44
Security: bearerAuth

## Request fields (application/json):

  - `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 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 201 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 401 fields

## Response 500 fields