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# PassFields.SecondaryFields

An object that represents the fields that display supporting information on the front of a pass.

```
object PassFields.SecondaryFields
```

## Discussion

Use this field to provide information that people might not need every time they use the pass, for example, the flight number on a boarding pass, or a coupon expiration date.

Depending on the type of pass, you can use the secondary and auxiliary fields interchangeably. Coupons, store cards, and generic passes with a square barcode can have a combined total of up to four secondary and auxiliary fields.

## Relationships

### Inherits From

[`PassFieldContent`](/documentation/WalletPasses/PassFieldContent)

---

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