admin custom date disaplyed expiration message orders past process processing product shop stop transactions unable unavaiable user vacation

Is there a way to stop the processing of transactions, say "We're on vacation and unable to process orders. Please come back on xx/xx/08 " or something like that?

You can set an expiration date of past for each product in E-junkie admin. That will give user a message "product currently unavaiable".

Any custom message can simply be disaplyed on your shop itself.