diff --git a/payment-service/src/main/java/com/finpay/payment_service/models/PaymentGateway.java b/payment-service/src/main/java/com/finpay/payment_service/models/PaymentGateway.java
new file mode 100644
index 0000000..774a153
--- /dev/null
+++ b/payment-service/src/main/java/com/finpay/payment_service/models/PaymentGateway.java
@@ -0,0 +1,30 @@
+package com.finpay.payment_service.models;
+
+import lombok.*;
+import java.util.Set;
+import java.util.UUID;
+
+@Entity
+@Table(name = "payment_gateways")
+@Data
+@NoArgsConstructor
+@AllArgsConstructor
+@Builder
+public class PaymentGateway {
+
+    @Id
+    @GeneratedValue
+    private UUID id;
+
+    @Column(nullable = false, unique = true)
+    private String name; // e.g., Stripe, PayPal, Square
+
+    @Column(nullable = false)
+    private String apiEndpoint;
+
+    @Column(nullable = false)
+    private String apiKey;
+
+    @OneToMany(mappedBy = "paymentGateway", cascade = CascadeType.ALL, orphanRemoval = true)
+    private Set<Payment> payments;
+}
diff --git a/payment-service/src/main/java/com/finpay/payment_service/models/PaymentMethod.java b/payment-service/src/main/java/com/finpay/payment_service/models/PaymentMethod.java
new file mode 100644
index 0000000..3c8324a
--- /dev/null
+++ b/payment-service/src/main/java/com/finpay/payment_service/models/PaymentMethod.java
@@ -0,0 +1,24 @@
+package com.finpay.payment_service.models;
+
+import lombok.*;
+import java.util.Set;
+import java.util.UUID;
+
+@Entity
+@Table(name = "payment_methods")
+@Data
+@NoArgsConstructor
+@AllArgsConstructor
+@Builder
+public class PaymentMethod {
+
+    @Id
+    @GeneratedValue
+    private UUID id;
+
+    @Column(nullable = false, unique = true)
+    private String type; // e.g., CREDIT_CARD, BANK_TRANSFER, DIGITAL_WALLET
+
+    @OneToMany(mappedBy = "paymentMethod", cascade = CascadeType.ALL, orphanRemoval = true)
+    private Set<Payment> payments;
+}
diff --git a/payment-service/src/main/java/com/finpay/payment_service/models/Refund.java b/payment-service/src/main/java/com/finpay/payment_service/models/Refund.java
new file mode 100644
index 0000000..de23413
--- /dev/null
+++ b/payment-service/src/main/java/com/finpay/payment_service/models/Refund.java
@@ -0,0 +1,38 @@
+package com.finpay.payment_service.models;
+
+import lombok.*;
+import java.math.BigDecimal;
+import java.time.LocalDateTime;
+import java.util.UUID;
+
+@Entity
+@Table(name = "refunds")
+@Data
+@NoArgsConstructor
+@AllArgsConstructor
+@Builder
+public class Refund {
+
+    @Id
+    @GeneratedValue
+    private UUID id;
+
+    @Column(nullable = false, unique = true)
+    private String refundReference; // Unique reference for the refund
+
+    @Enumerated(EnumType.STRING)
+    @Column(nullable = false)
+    private RefundStatus status;
+
+    @Column(nullable = false)
+    private BigDecimal amount;
+
+    @ManyToOne(fetch = FetchType.LAZY)
+    @JoinColumn(name = "payment_id")
+    private Payment payment;
+
+    @Column(nullable = false)
+    private LocalDateTime createdAt;
+
+    private LocalDateTime updatedAt;
+}
diff --git a/payment-service/src/main/java/com/finpay/payment_service/models/RefundStatus.java b/payment-service/src/main/java/com/finpay/payment_service/models/RefundStatus.java
new file mode 100644
index 0000000..c4fd9f4
--- /dev/null
+++ b/payment-service/src/main/java/com/finpay/payment_service/models/RefundStatus.java
@@ -0,0 +1,7 @@
+package com.finpay.payment_service.models;
+
+public enum RefundStatus {
+    INITIATED,
+    COMPLETED,
+    FAILED
+}
diff --git a/payment-service/src/main/java/com/finpay/payment_service/models/TransactionStatus.java b/payment-service/src/main/java/com/finpay/payment_service/models/TransactionStatus.java
new file mode 100644
index 0000000..c2b8390
--- /dev/null
+++ b/payment-service/src/main/java/com/finpay/payment_service/models/TransactionStatus.java
@@ -0,0 +1,7 @@
+package com.finpay.payment_service.models;
+
+public enum TransactionStatus {
+    SUCCESS,
+    FAILURE,
+    PENDING
+}
diff --git a/payment-service/src/main/java/com/finpay/payment_service/models/TransactionType.java b/payment-service/src/main/java/com/finpay/payment_service/models/TransactionType.java
new file mode 100644
index 0000000..1ad22f3
--- /dev/null
+++ b/payment-service/src/main/java/com/finpay/payment_service/models/TransactionType.java
@@ -0,0 +1,7 @@
+package com.finpay.payment_service.models;
+
+public enum TransactionType {
+    INITIATION,
+    RETRY,
+    REFUND
+}