How can you work out whether an integration is using HMAC-SHA1?

Well I found out when it broke last summer during the test window 😆. You can also do this: "Create Your Own Test Window for HMAC-SHA1 in TBA Integrations" SuiteAnswer ID: 100728. Otherwise you have to actually know some technical stuff, which is slightly beyond me, or at least the time I have to learn it.