I have a Fedex label stored as a base64 string representing a PNG file  on my ERP server. I have to print it on different printers determined by the ERP. Is there a way to create a REST integration that accepts the PNG data in some form (maybe base64) in addition to the printer name and prints it? Alternatively, I managed to create a file integration that polls for the file (that I create from this string in my ERP server) and prints it, but then I do not know how to pass the printer name. Can I do it somehow in the filename? Thanks!