The claim of refund will be sanctioned by the proper officer in Form GST RFD-06 :

Is there any specified format for sanction of refund claim?

Ans. The claim of refund will be sanctioned by the proper officer in Form GST RFD-06 if the claim is found to be in order and payment advice will be issued in Form GST RFD-05. The refund amount will then be electronically credited to the applicants given bank account.