Members of a civic organization hold a protest against Shinsegae Group, the owner of Starbucks Korea, against the coffee franchise's ″Tank Day″ promotion, on May 27, in Gwanghwamun, central Seoul. Seen in the picture is the face of Chung Yong-jin, chairman of Shinsegae Group. [YONHAP]

Starbucks Korea’s weekly payment volume dropped by more than 8 billion won ($5.3 million) in the week following controversy over its “Tank Day” event, data showed Wednesday.

According to Mobile Index, operated by AI tech company IGAWorks, Starbucks Korea recorded 23.69 billion won in weekly payments between May 18 — when the controversy erupted — and Sunday.

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The figure marked a decrease of about 8.47 billion won from 32.16 billion won recorded the previous week, from May 11 to 17, representing a 26.3 percent decline. Compared with the 31.48 billion won posted between May 4 and 10, payment volume also fell by about 25 percent.