Hi @Sandra_Dalziel,
I have written a guide to help out in finding what integrations maybe using the Legacy API Key.
What you need to do is to get Keap Support to provide you a report on the Legacy API Key Usage for your account. From there, it is basically trying to find out what integration maybe using it.
If you think that ClickFunnels is the only integration, then there are guides written by ClickFunnels in setting your Keap Connection to the platform. You need to use the V2 Infusionsoft integration, instead of the V1 Infusionsoft Integration.
- Email - https://support.clickfunnels.com/support/solutions/articles/150000152828-integrating-with-keap-infusionsoft-email
- Payment Gateway - https://support.clickfunnels.com/support/solutions/articles/150000152988-integrating-clickfunnels-with-keap
- Web Form - https://support.clickfunnels.com/support/solutions/articles/150000152797-connect-keap-with-your-page
If you believe you have other integrations, then I can help you out by taking a look.