Documentation on Liquid Variables in "Payment Error" Notification

[aramael]

Is there any reference to discover the liquid variables available to the "Payment Error" notification email from the Shopify Admin?

The available documentation doesn't even acknowledge the presence of this notification. From the default template it seems that theres access to the shop variable, and a url variable which seems to be a link back to the checkout, but none to the order properties or transaction information are available.