2 (5) “export of goods” with its grammatical variations and cognate expressions, means taking goods out of India to a place outside India;
2 (6) “export of services” means the supply of any service when,––
(i) the supplier of service is located in India;
(ii) the recipient of service is located outside India;
(iii) the place of supply of service is outside India;
(iv) the payment for such service has been received by the supplier of service in convertible foreign exchange; and
(v) the supplier of service and the recipient of service are not merely establishments of a distinct person in accordance with Explanation 1 in section 8;
Explanation 1of Section 8 .––For the purposes of this Act, where a person has,––
(i) an establishment in India and any other establishment outside India;
(ii) an establishment in a State or Union territory and any other establishment outside that State or Union territory; or
(iii) an establishment in a State or Union territory and any other establishment being a business vertical registered within that State or Union territory, then such establishments shall be treated as establishments of distinct persons.
,16. (1) “zero rated supply” means any of the following supplies of goods or services or both, namely:––
(a) export of goods or services or both; or
(b) supply of goods or services or both to a Special Economic Zone developer or a Special Economic Zone unit.
(2) Subject to the provisions of sub-section (5) of section 17 of the Central Goods and Services Tax Act, credit of input tax may be availed for making zero-rated supplies, notwithstanding that such supply may be an exempt supply.
(3) A registered person making zero rated supply shall be eligible to claim refund under either of the following options, namely:––
(a) he may supply goods or services or both under bond or Letter of Undertaking, subject to such conditions, safeguards and procedure as may be prescribed, without payment of integrated tax and claim refund of unutilised input tax credit; or
(b) he may supply goods or services or both, subject to such conditions, safeguards and procedure as may be prescribed, on payment of integrated tax and claim refund of such tax paid on goods or services or both supplied, in accordance with the provisions of section 54 of the Central Goods and Services Tax Act or the rules made there under.
Process for claiming the refund could be understand through this link.