feat: Tosspay 전용 예외코드 추상화 및 확정 / 취소에서의 예외 정의

tosspay-mock/src/main/kotlin/com/sangdol/tosspaymock/exception/TosspayExceptionHandler.kt

@@ -0,0 +1,29 @@
+package com.sangdol.tosspaymock.exception
+
+import com.sangdol.common.types.web.CommonErrorResponse
+import io.github.oshai.kotlinlogging.KLogger
+import io.github.oshai.kotlinlogging.KotlinLogging
+import org.springframework.http.ResponseEntity
+import org.springframework.web.bind.annotation.ExceptionHandler
+import org.springframework.web.bind.annotation.RestControllerAdvice
+
+private val log: KLogger = KotlinLogging.logger {}
+
+@RestControllerAdvice
+class TosspayExceptionHandler {
+
+    @ExceptionHandler(value = [TosspayException::class])
+    fun handleTosspayException(
+        e: TosspayException
+    ): ResponseEntity<CommonErrorResponse> {
+        val code = e.errorCode
+        val name = (code as Enum<*>).name
+        val message = e.message
+
+        log.warn { "[TosspayExceptionHandler] 결제 처리 과정 중 오류 발생: error=${name}, message=$message" }
+
+        return ResponseEntity
+            .status(code.httpStatus.value())
+            .body(CommonErrorResponse(name, message))
+    }
+}