NewPayload returns a new Payload struct.

InterruptionLevelActive is used to indicate the importance and delivery timing of a notification.

InterruptionLevelCritical is used to indicate the importance and delivery timing of a notification.

InterruptionLevelPassive is used to indicate that notification be delivered in a passive manner.

InterruptionLevelTimeSensitive is used to indicate the importance and delivery timing of a notification.

Payload represents a notification which holds the content that will be marshalled as JSON.

InterruptionLevel defines the value for the payload aps interruption-level.