To frame my question... I have never used FMP URL calls and am not familiar with the scheme. I'm finishing up development of a POS system hosted by our server, have a robot machine handling printing to bar and kitchen printers. FileMaker Go is used on iPad minis for customer orders and CardSwipe / 360Works Plastc for Credit cards. But I'm at a loss as how to construct a URL to send data and receive callback from a Star Micronics SM-S230i printer that actually works. The PassPrnt Manual hasn't been much help, probably because I'm old... Anyway, does anyone have an example url or file to get me on track? I'd like to concatenate a couple fields and get a callback on print success to display via show message.