Part of Klook's 10th Birthday Promotion:
Click on OP link and follow the 2 steps i.e. update your profile details and answer an easy survey. Within 24 Hours an eSIM promo code will be added to your account which can be redeemed to any 1GB Klook eSIM (only Klook eSIM, they also sell other eSIM's on their website which are not part of this promotion, eSIMs are listed at the bottom of the page).
If you are a Gold Member of Klook, you will get further 2 promo codes of 1GB each after using the 1st promo code.
Haven't tried it but I assume this should work with new accounts as by default they get the basic Explorer membership which is eligible for 1GB.
I was also able to claim this on an account where I already claimed Newbie code previously.
More detailed FAQ and T&C at the bottom of the page.
Enjoy!
The promo codes are valid for 3 months from issuance. Remember to use them at checkout when booking travel eSIM on Klook before they expire. The travel eSIM can be used for 180 days after booking confirmation.