Michael MD
 Sydney, AU 
if you want me to go to your event and there is a ticket price,
make sure there are tickets available on the door.

don't ask me to put credit card details into a web browser unless I can be 100% there are no upstreams in that browser!

and don't suggest a phone app - THAT IS WORSE
Michael MD
  
I would rather not use that method of payment even offline, because I don't like the idea of giving such credentials to strangers.