originationIdentity

The origination identity to use, such as PhoneNumberId, PhoneNumberArn, SenderId, or SenderIdArn. You can use DescribePhoneNumbers to find the values for PhoneNumberId and PhoneNumberArn, while DescribeSenderIds can be used to get the values for SenderId and SenderIdArn.

If you are using a shared End User Messaging SMS resource then you must use the full Amazon Resource Name(ARN).