Editing: NotificationChannel.md
# # NotificationChannel Representing a notification channel for sending messages. ```php use Xendit\Invoice\NotificationChannel; ``` ## Enum * `EMAIL` (value: `'email'`) * `SMS` (value: `'sms'`) * `WHATSAPP` (value: `'whatsapp'`) * `VIBER` (value: `'viber'`) * `XENDIT_ENUM_DEFAULT_FALLBACK` (value: `UNKNOWN_ENUM_VALUE`) If you encounter `UNKNOWN_ENUM_VALUE`, it means that this ENUM is unavailable in your current SDK version. Please upgrade to get the newest ENUM. [[Back to README]](../../README.md)
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