Purchase event setup

In my event manager, Purchase event tracking is not shown. So I couldn't make a purchase conversion Ad campaign. Hope you know how important this is for a business that completely depends on Facebook Marketing. I request you provide me a solution for this. I contacted the Facebook support team and they are the ones who asked me to post the question here so that you can find me a solution asap. I have attached a screenshot for the reference

Bharathi Kannamma
Asked about a month ago