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Hi @ptsanders, since you are referring to our Pro version and WordPress does not allows us to provide support in this forum only for our Free version, please send us a message via our Premium Support form here: https://www.cartbounty.com/premium-support/
But briefly – we do not have some specific restrictions, you should be able to use webhook with any system, Pabbly, Make or your custom one. Please contact us via the form and we will provide additional details and help find a solution.