Regulations Governing VAT Refund Claims by Foreign Travelers Purchasing Goods Eligible for VAT Refund Article 15

If no data for a foreign traveler holding a manually issued VAT Refund Claim Form can be found in the VAT refund system, or the VAT refund system is not operating due to network interruption or for any other reason, the foreign traveler shall apply for a VAT refund directly with the Private tax refund operator.When the Private tax refund operator receives an application made pursuant to the preceding paragraph, it shall confirm the accuracy of the information on the VAT refund application before it may carry out the VAT refund operations, except in the case of foreign travelers who have been screened in for customs inspection and have passed the inspection. The authorized store and the Private tax refund operator shall also complete the supplemental creation of the data file for the application as soon as possible.
中文原文 外籍旅客購買特定貨物申請退還營業稅實施辦法第15條
外籍旅客持人工開立之退稅明細申請表,於退稅系統查無資料,或退稅系統因網路中斷或其他事由致無法作業時,應逕洽民營退稅業者申請退還營業稅。
民營退稅業者受理前項申請,除經退稅系統篩選須經海關查驗無訛者外,應於確認申請退稅資料無誤後,始得辦理退稅,並由特定營業人及民營退稅業者儘速完成補建檔。

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