No, we do not provide such a service.
There are not standard printing systems among mobile device's OSs or drivers. If a printing function is added to an application,
 1. send a printer printing data generated by an application.
 2. use SDK for printing.

1.
Bluetooth or wireless communications to print are recognized as a virtual COM port by a mobile device and as a serial port by a printer.
Most of the OSs of a mobile device is equipped with a function outputting data to a serial port. You succeed to print according to the function.

It's possible for a POS printer to print only with text and a line feed code. In addition of that, commands equipped with a printer enable a printer to generate the modification character.
Refer to the command reference for detail.

2.
Refer to the following web site, which provide SDK for some models.
http://www.citizen-systems.co.jp/english/support/download/printer/sdk/index.html