That sounds like a good place to me. I haven't used that extension in a while though, so you might try few timesDo I add web hook url under "subscription confirmed" page?
@Jason Thompson - Why not have the SUB_ID as a custom field in mailwizz, then when redirecting to the thank you page from mailwizz > list > pages > confirm subscription, include it in the url, like: ?sub_id=[SUB_ID] which would parse the [SUB_ID] tag to it's right value.
Basically something like:
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