1 Dates moved
A Vietnam eVisa allows a stay of up to 3 months, inside the window printed on your approval. New dates inside that window are normally fine. New dates outside it need a fresh application and a fresh US$55–US$80 government fee — allow 5 working days again.
2 Route or entry point changed
Check that the permit you hold matches what you will actually do on arrival — the purpose of travel you applied under is part of the approval.
3 Trip now involves leaving and coming back
Vietnam issues Single Entry and Multiple Entries products. A single-entry approval is used up when you leave, so if your new plan crosses the border twice you need a multiple-entry permit, not the one you hold.
4 Trip cancelled entirely
The government fee is tied to the assessment, not to whether you travel, so it is not returned. Nothing needs to be cancelled — an unused permit simply lapses at the end of its window.
5 If you need to reapply
Work through the Vietnam eVisa requirements checklist, then continue to the application flow. Other questions for this destination are collected in the Vietnam eVisa FAQ.
United eVisa Services is a private application-support provider, not a government agency. The immigration authority makes the decision.