how to get invoice file (pdf) via sdk

hi

i am entirely new to sap and its sdk

i see its possible to create a A/R invoice via the .net sdk

once im done, how can i access the physical pdf/tif or whatever for printing outside of the sap UI?

i dont need to actually initiate the printing, that i can do via windows as with any other file

i just need to get the file (bytes or path)

thanks in advance