How to push message to an AWS SNS topic

Hi Team,

Looking for a solution on one of my requirement where i have to publish a message to AWS sns topic from snaplogic. I am trying to use a Rest Post snap for that but i only have arn and iam role with me to make the connection.

When i am using this to send a message i am getting 403 error says missing token please help me here.

Is there any other alternative you can suggest?

Regards,
Hirak