A wrapper object with fields that allow reference to a Toast entity by Toast GUID.
| email required | string The email address corresponding to the guest who placed the order. The email address is the key that identifies a unique restaurant guest, and all distinct guests should have distinct email addresses. | 
| entityType required | string The type of object this is. | 
| firstName required | string First name of the guest who placed the order. | 
| guid required | string The GUID maintained by Toast. | 
| lastName required | string Last name of the guest who placed the order. | 
| phone required | string The phone number corresponding to the guest who placed the order. | 
{- "guid": "string",
- "entityType": "string",
- "firstName": "string",
- "lastName": "string",
- "phone": "string",
- "email": "string"
}