GST refund show-cause notice identifies inadmissibility reasons and calls for a taxpayer response within a specified period. Form GST RFD-07 is a show cause notice for a refund application under the Goods and Services Tax, identifying the application by ARN and GSTIN, listing reasons for inadmissibility from a reason master or an other category with the amount inadmissible, and calling upon the applicant to submit a response within a specified number of days to explain why the refund claim should not be rejected.