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Currently, it is not possible to submit your IOSS ID number to PrintKK.
As we know, the IOSS ID number is used to customs declaration. Thus, we have to ensure the validity of your IOSS ID number. However, we can't validate your IOSS ID number efficiently. So, PrintKK doesn't offer the function to submit and validate your IOSS ID number. Of course, our team will continue to work on this problem.
