Excess Input credit

Dear Experts

1.Our company's business is export of Service. We are making invoice in AUD ( Australian Dollar ).Client has made the payment in INR  so FIRC also issued in INR . Now how can I show in GST return , should we need to pay the GST ( like inland bill ).

2.As our company's bill is export bill so there is no out put GST ( as we have taken LUT ) but we have every month lot of ITC as we are outsourcing of software support service -- now my question is can we get the refund of the ITC ? If yes then what is the process for this ?

Waiting for reply

Thanks in advance

Gupta