Create order custom attribute definition

The custom attribute definition to create. Note the following:

• With the exception of the Selection data type, the schema is specified as a simple URL to the JSON schema definition hosted on the Square CDN. For more information, including supported values and constraints, see Specifying the schema.
• If provided, name must be unique (case-sensitive) across all visible customer-related custom attribute definitions for the seller.
• All custom attributes are visible in exported customer data, including those set to VISIBILITY_HIDDEN.