Change notification let your users know when field of your pass changed. Change notifications can also be used to send your users special messages. For a change message to appear, two conditions must hold
- A field must have a none-empty change message
- The value of the field must change
If both conditions are satisfied and the user has enabled lock screen messages, the message will be displayed to the user.
ℹ️ Tip: If you want to send arbitrary messages to users (not necessary connected to any field on the front), add a field for it on the back of the pass. Use a label like "Last Message" for the field and give the field the change message %@. This will allow you to write the message as the value of the field and this message will be used as change message. Please note that the message will only appear when the value of the field / message changes. So saving the template and pushing an update to the passes will not re-display an already displayed message.