How do you add security testing into the software development process?

With all my experience as a test automation engineer, I have understood that adding security testing in the software process is very important to make sure that the software is secure and can protect from all the bad consequences. Currently, my company is planning to incorporate security testing into the software development process with a automated tool, but I think we need to know more about the practices to do that. So if anyone could help in that, it would be great.

Note: name of tool removed by moderator as spam.