During the address verification, our shipper has some feedbacks on addresses, which we fixed manually by googling and standardising information. These mainly includes country / regions spelling, as well as putting fields into appropriate locations, for example, putting the US state to the state field instead of country field. These are manual work and will take some time.
However, the shipper also raised some questionable countries / regions, which they advised us to get a confirmation on tax and other costs associated with shipping. These countries / regions have rules that are not clear to outsiders like us.
For over 90% of the backers, this is not an issue, and likely, they will get a tracking number from us as the next email.