By disabling the NEFT/RTGS option in the payment options screen. While creating your first invoice, this is on screen 3. 

 If you have created multiple invoices earlier, you can edit the payment option from the " Online Payment" section at the top of the invoice page. 

If you are a first time user you can hide Bank Details On the Second Step.

If you are already a user you can hide Bank Details and Update it from the Preview Page.

Note: Payment Gateway services are only available for users in India as of now. We will get back for our 

          International Users shortly