What should I do if the merchant did not issue a stamp upon payment? NTUC Link Do remember to present your phone to the merchant upon payment so that he/she can issue you a stamp. Related articles The mobile app is not responding - who should I contact? Eligibility for the 300 LinkPoints reward My deal/stamp card has expired. Can I still use them? What should I do if a deal is reflected as "Redeemed" even though I have not redeemed it? Can I earn and redeem LinkPoints at stores using the Plus! App?