Hi Team, I need to modify Catalogclient.php file using plugin. Can anyone help me to create a plugin. I have tried creating a plugin but not sure which interface to implement and need some reference to create a plugin.

Well not sure what exactly you are trying to accomplish and if you elaborate more maybe I can help better, but here is a starting point: https://docs.spryker.com/docs/scos/dev/back-end-development/plugins/plugins.html