Optional
externalA unique alert ID generated by the application developer (maximum length: 32 characters).
Optional
headerA header text to display in the custom alert (maximum length: 255 characters).
Optional
imageA URL to an image that will be included in the alert (maximum length: 255 characters).
Optional
messageA message text to display in the custom alert (maximum length: 300 characters).
Optional
shouldDetermines whether the alert should be displayed immediately.
Optional
soundA URL to a sound file that will play when the custom alert is displayed (maximum length: 255 characters).
Data structure for sending a custom alert to Donation Alerts.