RetenoNotificationGroupingRule.byPayloadKey constructor
Uses the value stored under payloadKey in the push payload as group ID.
fallbackGroupId is used when the payload does not contain a non-empty
value for payloadKey. When it is null, that notification is not
assigned to a group.
Implementation
const RetenoNotificationGroupingRule.byPayloadKey(
String payloadKey, {
String? fallbackGroupId,
}) : this._(
payloadKey: payloadKey,
fallbackGroupId: fallbackGroupId,
);