Test purchase of goods and/or services :

The [Commissioner] of CGST/SGST or an officer authorized by him may cause purchase of any goods and/or services by any person authorized by him from the business premises of any taxable person, to check issue of tax invoices or bills of supply by such taxable person, and on return of goods so purchased by such officer, such taxable person or any person in charge of the business premises shall refund the amount paid towards the goods after cancelling any tax invoice or bill of supply issued.