Submit this travel pass upto 3 days before. Before uploading the vaccine certificate, convert it to international format (from CoWin App, if you haven’t yet, you need to add passport number) and only upload the QR code in the relevant section https://www.ica.gov.sg/enter-transit-depart/entering-singapore/sg-arrival-card Go to the vaccination check portal and follow the steps https://eservices.ica.gov.sg/STO1/VCP These steps will ensure all details are captured in their systems and you’ll breeze through their immigration Returning - remember Air Suvidha. do note that Air Suvidha is not accessible clearly on a phone and has file restrictions so do it BEFORE you leave India (yes can confirm no issues)