Macro to Create Ticket and Post new Comment - Comment Author

I have a small workflow set up that allows a user to use a macro which creates a new ticket and sends a message to the requester on the new ticket using webhooks in triggers.

The problem I am running into is the author of the comment on the new message. Since I use 'Basic Authentication' it always says it the email was from the user who is associated with the webhook. How can I notify a webhook and have the author be the person who used the macro on the original ticket?

Thank you everyone!