This is a scam
This is a scam. They are charging for a service that is free, namely the e-arrival document for (in my case) Cambodia. When I asked for a refund they gave me only 30 % of what I paid and when I asked for the rest they said they can only give one refund. I should have noticed it was a sponsored website and found the official site, which I now have used to get the document immediately and free.