# CustomerReference

Specify the reference field on the label (FedEx only).


## Fields

| Field                                                                                                                                                                                                                     | Type                                                                                                                                                                                                                      | Required                                                                                                                                                                                                                  | Description                                                                                                                                                                                                               |
| ------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- | ------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- | ------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- | ------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- |
| `prefix`                                                                                                                                                                                                                  | *Optional[str]*                                                                                                                                                                                                           | :heavy_minus_sign:                                                                                                                                                                                                        | Custom prefix for customer reference field (ZPL labels only). Up to 11 characters, including trailing <br/>spaces. Empty string indicates removal of default prefix. To use the default prefix, do not include<br/>this property. |
| `value`                                                                                                                                                                                                                   | *Optional[str]*                                                                                                                                                                                                           | :heavy_minus_sign:                                                                                                                                                                                                        | Optional text to be printed on the shipping label for customer reference. Up to 40 characters. If <br/>this is provided, reference_1 will be ignored.                                                                     |