validate ID if exist have to fetch the data and send Responses in CPI

Hi All,

Having multiple user ID's based on the user ID's the data have to fetch and sends the responses if it is exists . if User ID not exists the message have to stop/throw exception error like user id not exist.

How to write a groovy script. I'm new to groovy script. Can anyone help me here.

I am configuring this scenario in CPI using groovy script.