Can’t find Payment Date in the Payment or Order class

I’m working to an extension that needs to push to an external service every order and refund that happens on the shop. One of the needed infos it needs to pass is the payment date – and for the life of me I can’t find it, neither in the payment class nor in the order class:

Does someone know how to retrieve this information?
Shippings and Orders have the getCreatedAt() method, but I don’t find it for Payments, nor do I find anything similar, though it occurs to me as a basic info that should be available.

Thanks everyone!