// The phone number to which you want to deliver an SMS message. Use E.164 format.
	// If you don't specify a value for the PhoneNumber parameter, you must specify a
	// value for the TargetArn or TopicArn parameters.
	PhoneNumber *string

	// Optional parameter to be used as the "Subject" line when the message is
	// delivered to email endpoints. This field will also be included, if present, in
	// the standard JSON messages delivered to other endpoints. Constraints: Subjects
	// must be ASCII text that begins with a letter, number, or punctuation mark; must
	// not include line breaks or control characters; and must be less than 100
	// characters long.
	Subject *string

	// If you don't specify a value for the TargetArn parameter, you must specify a
	// value for the PhoneNumber or TopicArn parameters.
	TargetArn *string

	// The topic you want to publish to. If you don't specify a value for the TopicArn
	// parameter, you must specify a value for the PhoneNumber or TargetArn parameters.
	TopicArn *string