$this content(string $content) Set the content (text) of the attachment
$this fields(array $fields) Set the fields of the attachment.
$this subject(string $subject) Set the subject of the notification.
$this attachData(string $data, string $name, array $options = array()) Attach
$this error() Indicate that the notification gives information about an
array toArray() Get an array representation of the message.
$this action(string $text, string $url) Configure the "call to action"
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