https://github.com/bootpay/SwiftyBootpay/blob/a5d363e6991b8755672c045bdaa1b2484691f690/Example/SwiftyBootpay/WebAppController.swift#L212 사용환경 Xcode Version 12.0.1 Swift 5.3 replace(target: "'", withString: "\\'") => replacingOccurrences(of: "'", with: "\\'")