A custom field is an attribute you can create and apply to Mambu Payments (formerly Numeral) ressources your objects to attach business or technical data like categories, labels, or IDs.

Attribute	Description
id string	The ID of the custom field.
object string	Always `custom_field`.
key string	The key of the custom field, which is a unique and readable identifier, as opposed to its ID which is only unique.
name string	The name of the custom field, which is an understandable description of its purpose.
object_types array	The types of object this custom field can be applied to. Can be a combination of `payment_order`, `expected_payment`,`transaction`, `direct_debit_mandate`, `internal_account`, and `external_account`.
type integer	The type of the custom field. Can be either `select` or `text`.
values array	List of values the custom field can take. Only applicable to custom fields with `select` type.
created_at datetime	The UTC timestamp of the creation of the custom field.