Basic knowledge of Arm Treasure Data, including the TD Toolbelt.
A Google Firebase Project.
For substitution, NULL values will be truncated to ““ (empty string). If the substitution is for a numeric column, there will be a warning and the record is skipped.
Because the messages are sent individually, we will not revert the whole sessions. The error messages are logged to the TD Console, but the job will continue.
Strong knowledge of the Firebase message template structure.