Here is where you add content to the face of the pass. Each field requires a unique name that will be used by the API when updating the pass. Each pass type has a prescribed layout and a maximum number of fields. Apple Wallet will automatically shrink long text values and very long text values may be cut short.

Use the dynamic option if the label or data value will be different on each pass. If you add a change message, an alert will appear on the user's lock-screen or notification centre whenever the pass is updated with new data.