Like all adult S’poreans, my mum and I each got S$100 of the above,
I was planning to let them expire unused because I was told they were complicated to use and required me to spend $: seems to be like co-pay . Recently, I was told that I could donate them to charity and my FB friends gave me the links.
Turns out to be pretty complicated.
Worse my mum needs to have a Singpass to donate (let alone use the vouchers for herself) .
Given her age (97 and counting) it never made sense for her to have a Singpass account.
So I’m forced to let the vouchers expire.
Remember the above when you read that the PAP govt KPKBing that S’poreans not using the vouchers.
Thoughts of a Cynical Investor 
I have relatives & friends who used them for stuff like zoo, bird park, gardens by the bay, sentosa attractions, gardens by the bay etc which are less than the $100 value.
Since I already get to enjoy wifey’s free corporate pass to many of the above attractions, I used mine to subsidise a hotel stay. Wifey used hers to book the 2nd consecutive night. Since we can’t stack vouchers together, we had to book the same room under 2 names for consecutive days. Silly way of doing things to conform to a silly system.