diff --git a/src/main/java/com/acquirex/approval/domain/DomainClasses.java b/src/main/java/com/acquirex/approval/domain/DomainClasses.java
new file mode 100644
index 0000000..e4020fa
--- /dev/null
+++ b/src/main/java/com/acquirex/approval/domain/DomainClasses.java
@@ -0,0 +1,84 @@
+package com.acquirex.approval.domain;
+
+import java.math.BigDecimal;
+import java.time.LocalDateTime;
+import java.util.Objects;
+
+/**
+ * Approval status enumeration for card acquisition requests.
+ * Migrated to Jakarta EE 9+ for Spring Boot 3 compatibility.
+ */
+public enum ApprovalStatus {
+    PENDING,
+    APPROVED,
+    REJECTED,
+    CANCELLED
+}
+
+/**
+ * Card acquisition approval entity.
+ * Migrated to Jakarta EE 9+ (jakarta.*) for Spring Boot 3 compatibility.
+ */
+public class CardAcquisitionApproval {
+    private Long id;
+    private String requestId;
+    private String cardNumber;
+    private String merchantId;
+    private BigDecimal amount;
+    private ApprovalStatus status;
+    private LocalDateTime createdAt;
+    private LocalDateTime updatedAt;
+    private String approvedBy;
+
+    public CardAcquisitionApproval() {}
+
+    public CardAcquisitionApproval(Long id, String requestId, String cardNumber,
+                                   String merchantId, BigDecimal amount,
+                                   ApprovalStatus status, LocalDateTime createdAt,
+                                   LocalDateTime updatedAt, String approvedBy) {
+        this.id = id;
+        this.requestId = requestId;
+        this.cardNumber = cardNumber;
+        this.merchantId = merchantId;
+        this.amount = amount;
+        this.status = status;
+        this.createdAt = createdAt;
+        this.updatedAt = updatedAt;
+        this.approvedBy = approvedBy;
+    }
+
+    public Long getId() { return id; }
+    public void setId(Long id) { this.id = id; }
+    public String getRequestId() { return requestId; }
+    public void setRequestId(String requestId) { this.requestId = requestId; }
+    public String getCardNumber() { return cardNumber; }
+    public void setCardNumber(String cardNumber) { this.cardNumber = cardNumber; }
+    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 ApprovalStatus getStatus() { return status; }
+    public void setStatus(ApprovalStatus status) { this.status = status; }
+    public LocalDateTime getCreatedAt() { return createdAt; }
+    public void setCreatedAt(LocalDateTime createdAt) { this.createdAt = createdAt; }
+    public LocalDateTime getUpdatedAt() { return updatedAt; }
+    public void setUpdatedAt(LocalDateTime updatedAt) { this.updatedAt = updatedAt; }
+    public String getApprovedBy() { return approvedBy; }
+    public void setApprovedBy(String approvedBy) { this.approvedBy = approvedBy; }
+
+    @Override
+    public boolean equals(Object o) {
+        if (this == o) return true;
+        if (o == null || getClass() != o.getClass()) return false;
+        CardAcquisitionApproval that = (CardAcquisitionApproval) o;
+        return Objects.equals(id, that.id) && Objects.equals(requestId, that.requestId);
+    }
+
+    @Override
+    public int hashCode() { return Objects.hash(id, requestId); }
+
+    @Override
+    public String toString() {
+        return "CardAcquisitionApproval{id=" + id + ", requestId='" + requestId + "', status=" + status + "}";
+    }
+}
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