sir,
According to second proviso to rule 89 (1) of CGST rules, 2017 "in respect of supplies to a Special Economic Zone unit or a Special Economic Zone developer, the application for refund shall be filed by the –
(a) supplier of goods after such goods have been admitted in full in the Special Economic Zone for authorised operations, as endorsed by the specified officer of the Zone;
(b) supplier of services along with such evidence regarding receipt of services for authorised operations as endorsed by the specified officer of the Zone:
The refund application has to be filed electronically in the common portal in form GST RFD-01.