NASBAのシステム変更の為、
2018年2月17日(土)から2018年3月4日(日)までの間は
NTSの発行/再発行、全ての支払ができないとの事なので
つまりは、オンライン出願、日本受験手数料の支払ができないという事ですね。
プロメトリックセンターでの受験予約には影響ありません。
To systematically migrate and successfully deploy the new system, there will be a window of time the system will be unavailable to candidates. During this period, the system will not be able to print or reprint Notices to Schedule (NTS) or accept any payments. Therefore, all NTSs and payments must be completed in the current Gateway system prior to 10:00 pm CST on Friday, February 16, 2018. The new Gateway system will be available on March 5, 2018, at 12:00 am CST. Consequently, no NTSs will be issued or reprinted and no payments can be received beginning February 17, 2018 through March 4, 2018.
Scheduling with Prometric and candidate testing will not be affected by this conversion process.
https://nasba.org/exams/news/new-gateway-and-national-candidate-database/