[Square] A response to `POST /v2/customers`

The API specification: docs.connect.squareup.com/api/connect/v2#endpoint-createcustomer

{
	"customer": {
		"address": {
			"address_line_1": "500 Electric Ave",
			"address_line_2": "Suite 600",
			"locality": "New York",
			"administrative_district_level_1": "NY",
			"postal_code": "10003",
			"country": "US"
		},		
		"created_at": "2016-03-23T20:21:54.859Z",
		"email_address": "Amelia.Earhart@example.com",
		"family_name": "Earhart",
		"given_name": "Amelia",
		"id": "JDKYHBWT1D4F8MFH63DBMEN8Y4",
		"note": "a customer",
		"phone_number": "1-212-555-4240",
		"reference_id": "YOUR_REFERENCE_ID",
		"updated_at": "2016-03-23T20:21:54.859Z"
	}
}