In theory using the scan should be more convenient/efficient than paying with cash. However, it seems like the steps to pay with the scan make it a little less efficient due to opening the app, scanning, waiting, look at phone, show phone to vendor, wait for vendor to confirm. It takes slightly longer than just using cash, but the timing in this context makes a difference. It’s not quick like Apple Pay or Tap pay like in the U.S. but maybe it’ll improve over time.
And I’m glad you and others got it, really. It just seems like some US embassies are getting strict with soft power requirements now and 1 appointment letter may no longer be enough for DTV. 6 months of appointments might be a better bet.
I don’t know man I think you got lucky and squeaked through with that one. I submitted an official appointment letter from Bangkok Hospital and the embassy in Los Angeles said it doesn’t qualify for DTV, but my application is still showing pending. Be glad yours was accepted but I think others shouldn’t count on it.