🌟Allow customization/templating of 'order not successful' email

[anthonyrom]

Is your feature request related to a problem? Please describe.
"Order not successful" emails are not customizable/templated, and they include the HiEvents support email address (rather than the organizer's support email)

Describe the solution you'd like
This message should be customizable, either at the event or organizer level (or both, with the option for the event to inherit from the organizer)

Additional context
N/A

[daveearley]

This is coming soon!