Draft send an SMS message from an SMS template

Basic authentication header of the form Basic <encoded-value>, where <encoded-value> is the base64-encoded string username:password.

The ID of the SMS template

The ID of the phone number to send the SMS from

The phone number to send the SMS to

Variables to use in the email template

The phone number the SMS message would be sent from

The message that would be sent

The phone number the SMS message would be sent to