diff --git a/proj-acquirex/src/main/java/com/acquirex/approval/domain/ApprovalDomain.java b/proj-acquirex/src/main/java/com/acquirex/approval/domain/ApprovalDomain.java
new file mode 100644
index 0000000..24a976b
--- /dev/null
+++ b/proj-acquirex/src/main/java/com/acquirex/approval/domain/ApprovalDomain.java
@@ -0,0 +1,76 @@
+package com.acquirex.approval.domain;
+
+import jakarta.validation.constraints.NotBlank;
+import jakarta.validation.constraints.NotNull;
+import jakarta.validation.constraints.Positive;
+import java.math.BigDecimal;
+import java.time.LocalDateTime;
+import java.util.UUID;
+
+/** 카드 매입 승인 도메인 - Jakarta EE 9+ */
+public class ApprovalDomain {
+
+    public enum Status { PENDING, APPROVED, REJECTED, CANCELLED }
+
+    public static class Request {
+        @NotBlank(message = "거래 ID는 필수입니다")
+        private String transactionId;
+        @NotBlank(message = "가맹점 ID는 필수입니다")
+        private String merchantId;
+        @NotNull @Positive private BigDecimal amount;
+        @NotBlank private String cardNumber;
+        private LocalDateTime requestTime = LocalDateTime.now();
+
+        public Request() {}
+        public Request(String transactionId, String merchantId, BigDecimal amount, String cardNumber) {
+            this.transactionId = transactionId; this.merchantId = merchantId;
+            this.amount = amount; this.cardNumber = cardNumber;
+        }
+        public String getTransactionId() { return transactionId; }
+        public void setTransactionId(String transactionId) { this.transactionId = transactionId; }
+        public String getMerchantId() { return merchantId; }
+        public void setMerchantId(String merchantId) { this.merchantId = merchantId; }
+        public BigDecimal getAmount() { return amount; }
+        public void setAmount(BigDecimal amount) { this.amount = amount; }
+        public String getCardNumber() { return cardNumber; }
+        public void setCardNumber(String cardNumber) { this.cardNumber = cardNumber; }
+        public LocalDateTime getRequestTime() { return requestTime; }
+    }
+
+    public static class Response {
+        private String approvalId;
+        private String transactionId;
+        private Status status;
+        private String message;
+        private LocalDateTime approvalTime = LocalDateTime.now();
+
+        public Response() {}
+        public Response(String approvalId, String transactionId, Status status, String message) {
+            this.approvalId = approvalId; this.transactionId = transactionId;
+            this.status = status; this.message = message;
+        }
+        public static Response success(String approvalId, String transactionId) {
+            return new Response(approvalId, transactionId, Status.APPROVED, "매입 승인 완료");
+        }
+        public static Response rejected(String transactionId, String reason) {
+            return new Response(null, transactionId, Status.REJECTED, reason);
+        }
+        public static Response cancelled(String approvalId) {
+            return new Response(approvalId, null, Status.CANCELLED, "매입 취소 완료");
+        }
+        public String getApprovalId() { return approvalId; }
+        public void setApprovalId(String approvalId) { this.approvalId = approvalId; }
+        public String getTransactionId() { return transactionId; }
+        public void setTransactionId(String transactionId) { this.transactionId = transactionId; }
+        public Status getStatus() { return status; }
+        public void setStatus(Status status) { this.status = status; }
+        public String getMessage() { return message; }
+        public void setMessage(String message) { this.message = message; }
+        public LocalDateTime getApprovalTime() { return approvalTime; }
+        public void setApprovalTime(LocalDateTime approvalTime) { this.approvalTime = approvalTime; }
+    }
+
+    public static String generateApprovalId() {
+        return "APR-" + UUID.randomUUID().toString().substring(0, 8).toUpperCase();
+    }
+}
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