diff --git a/src/main/java/com/acquirex/dto/Dtos.java b/src/main/java/com/acquirex/dto/Dtos.java
new file mode 100644
index 0000000..4f835b3
--- /dev/null
+++ b/src/main/java/com/acquirex/dto/Dtos.java
@@ -0,0 +1,84 @@
+package com.acquirex.dto;
+
+import jakarta.validation.constraints.*;
+import java.math.BigDecimal;
+import java.time.LocalDateTime;
+
+// ===== ApprovalRequestDto =====
+class ApprovalRequestDto {
+    @NotBlank(message = "카드 번호는 필수입니다")
+    @Size(max = 20)
+    private String cardNumber;
+
+    @NotBlank(message = "카드사 코드는 필수입니다")
+    @Size(max = 10)
+    private String cardCompanyCode;
+
+    @NotBlank(message = "가맹점 번호는 필수입니다")
+    @Size(max = 15)
+    private String merchantNumber;
+
+    @NotNull(message = "거래 금액은 필수입니다")
+    @DecimalMin(value = "0.01")
+    @Digits(integer = 13, fraction = 2)
+    private BigDecimal amount;
+
+    @DecimalMin(value = "0.00")
+    @Digits(integer = 13, fraction = 2)
+    private BigDecimal vat;
+
+    public String getCardNumber() { return cardNumber; }
+    public void setCardNumber(String cardNumber) { this.cardNumber = cardNumber; }
+    public String getCardCompanyCode() { return cardCompanyCode; }
+    public void setCardCompanyCode(String cardCompanyCode) { this.cardCompanyCode = cardCompanyCode; }
+    public String getMerchantNumber() { return merchantNumber; }
+    public void setMerchantNumber(String merchantNumber) { this.merchantNumber = merchantNumber; }
+    public BigDecimal getAmount() { return amount; }
+    public void setAmount(BigDecimal amount) { this.amount = amount; }
+    public BigDecimal getVat() { return vat; }
+    public void setVat(BigDecimal vat) { this.vat = vat; }
+}
+
+// ===== ApprovalResponseDto =====
+class ApprovalResponseDto {
+    private Long approvalId;
+    private String transactionId;
+    private String approvalNumber;
+    private String status;
+    private BigDecimal amount;
+    private BigDecimal vat;
+    private LocalDateTime approvedAt;
+    private String message;
+
+    public ApprovalResponseDto() {}
+
+    public ApprovalResponseDto(Long approvalId, String transactionId, String approvalNumber,
+                                String status, BigDecimal amount, BigDecimal vat,
+                                LocalDateTime approvedAt, String message) {
+        this.approvalId = approvalId;
+        this.transactionId = transactionId;
+        this.approvalNumber = approvalNumber;
+        this.status = status;
+        this.amount = amount;
+        this.vat = vat;
+        this.approvedAt = approvedAt;
+        this.message = message;
+    }
+
+    public Long getApprovalId() { return approvalId; }
+    public void setApprovalId(Long approvalId) { this.approvalId = approvalId; }
+    public String getTransactionId() { return transactionId; }
+    public void setTransactionId(String transactionId) { this.transactionId = transactionId; }
+    public String getApprovalNumber() { return approvalNumber; }
+    public void setApprovalNumber(String approvalNumber) { this.approvalNumber = approvalNumber; }
+    public String getStatus() { return status; }
+    public void setStatus(String status) { this.status = status; }
+    public BigDecimal getAmount() { return amount; }
+    public void setAmount(BigDecimal amount) { this.amount = amount; }
+    public BigDecimal getVat() { return vat; }
+    public void setVat(BigDecimal vat) { this.vat = vat; }
+    public LocalDateTime getApprovedAt() { return approvedAt; }
+    public void setApprovedAt(LocalDateTime approvedAt) { this.approvedAt = approvedAt; }
+    public String getMessage() { return message; }
+    public void setMessage(String message) { this.message = message; }
+}
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