GST refund is applicable for tourist visiting Singapore from overseas or transiting through Singapore (crew member of the aircraft or ship that are departing from Singapore are not entitled).
You will be required to present your original passport* and invoice personally at these 6 Challenger outlets to prove your eligibility(claiming on behalf of friends, family members and etc are not permitted).
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Learn more about eligibility requirements here.
Learn more about eligibility on GST refund here.
*Photocopy and/or images of the passport are not accepted