The printing of payment receipts is responsibility of the operator using the devices. To be able to do this, the integrator will need to add the *.jar library provided, which will allow the POS to be connected to peripheral elements, like a printer.

To integrate the NeptuneLiteAPI *.jar library and enable receipt printing, follow the steps below:

1. Open your project in Android Studio and go to File > Project Structure > Dependencies.

2. Select the "+" button, which corresponds to creating a new module. A popup window will appear for you to select the type of module, which should be "Import .JAR/.AAR Package."

3. In the next window, browse for the path to the required library by clicking the search button located on the right side of the "File name" field.

4. Press the Finish button and add the library as a Module Dependency to the project.

And that's it! The .jar import was successful, and you can now use the library for printing.

To perform a print using the Demo App RDC, you should instantiate the object as follows:

Printer printer = Printer.getInstance(); 
printer.init(); 
int status = printer.getPrinterStatus(); 
if (status == 0) { 
    printer.printTaggedText(“TEXTO A IMPRIMIR”, "iso-8859-1"); 
} else{ 
    Log.e(TAG_IMPRESION, "La impresora presenta el siguiente inconveniente: " +  statusCode2Str(status); 
} 
printer.start();  
 

Below, you can see the possible values that the field printer.getPrinterStatus() can return, depending on the state of the printer that will receive the command.