As you have already booked flights and your friends or family are pressuring you to organise activities, travel, etc
You can potentially wait a week or two but the later it gets, the harder it becomes to rectify any issues application issues.
The possibility of Vietnam specific, Schengen VISA requirements becoming more difficult increases every day.
And, this $7 offer will not be around forever, as our competitors will begin to steal our intellectual property.
So, what is the right time to take action?