The Regulations on Collection,Custody and Use of Commercial Port Dues Article 12

The cargo port dues for international shipping routes shall be issued by the commercial port authority, which is entitled to link with customs clearance network to receive exporting and importing manifests and cargo release information, as well as any other necessary information required for calculating the dues, and for preparing the declaration form, and for issuing a bill after approving the dues.The cargo port dues for domestic shipping routes shall be issued by the commercial port authority after receiving the necessary billing information such as the tonnage of cargo from the commercial port operator and issuing a bill after approving the dues.
中文原文 商港服務費收取保管及運用辦法第12條
國際航線之貨物商港服務費,由航港局經通關網路連線接收進出口艙單及自海關連線接收進出口貨物放行通知訊息等之必要計費資料,於核定後填發繳納單。
國內航線之貨物商港服務費,由航港局自商港經營事業機構接收船舶貨物噸數等之必要計費資料,於核定後填發繳納單。

English translation for reference only; the Chinese text prevails. Not legal advice.