How can I launch a bot attack on a website

I am performing security testing on e-commerce web application and as part of the scope I have to launch bot attack on the application to ensure the bot manager blocks the bad bots. How can I launch the bot attack on an application?

Using performance testing tool, I can send hundreds of request to an application at the same time, however, how can I utilize performance testing tool to launch bot attack on the application?

Thanks

Basha