Cross platform print tray application

I need a cross platform application that will print a receipt provided from remote JSON file. Application should check in 5 seconds interval if there is a print job. If there is a job it takes the desired formatted file (you tell me what format is the best and i will provide it) and prints it on selected printer. When printing is done it sends post to my REST server that the job is done. - application needs a settings window to set api key, api url, desired printer and the interval. - printing should work on thermal cutter printers (POS) and also on desktop printers