Hello Pradeep. My guess is that you are trying to do this with a Triggered Task. You can only execute triggered tasks using Basic Authentication (username/password) or using a Bearer Token.
Ultra Tasks can be executed by Bearer Token, Basic Authentication, or anonymously if you clear the bearer token value from the Task.
Please refer to the main Tasks Page documentation for a description and comparison of the different types of tasks.
However, you can can use the API Policy Manager feature to create anonymous permissions to execute tasks within a project. You may wish to contact your SnapLogic CSM for pricing and a demo.
