Still trying to figure out how to cancel since ordered with a guest account and used PayPal. Can see the Oculus Ireland prepayment in PayPal, might just cancel that?
Just send Oculus a support ticket with your order number, they asked me a few security questions and it was done.
Don't start trying to cancel PayPal payments as that will screw things up and they'll probably just keep retrying the payment.
Second option in the dropdown is cancellation request...
https://support.oculus.com/hc/en-us/requests/new