Add PayU payment link API

src/main/kotlin/com/android/trisolarisserver/models/payment/PayuPaymentLinkSettings.kt

@@ -0,0 +1,42 @@
+package com.android.trisolarisserver.models.payment
+
+import com.android.trisolarisserver.models.property.Property
+import jakarta.persistence.Column
+import jakarta.persistence.Entity
+import jakarta.persistence.FetchType
+import jakarta.persistence.GeneratedValue
+import jakarta.persistence.Id
+import jakarta.persistence.JoinColumn
+import jakarta.persistence.ManyToOne
+import jakarta.persistence.Table
+import jakarta.persistence.UniqueConstraint
+import java.time.OffsetDateTime
+import java.util.UUID
+
+@Entity
+@Table(
+    name = "payu_payment_link_settings",
+    uniqueConstraints = [UniqueConstraint(columnNames = ["property_id"])]
+)
+class PayuPaymentLinkSettings(
+    @Id
+    @GeneratedValue
+    @Column(columnDefinition = "uuid")
+    val id: UUID? = null,
+
+    @ManyToOne(fetch = FetchType.LAZY, optional = false)
+    @JoinColumn(name = "property_id", nullable = false)
+    var property: Property,
+
+    @Column(name = "merchant_id", nullable = false, columnDefinition = "text")
+    var merchantId: String,
+
+    @Column(name = "access_token", nullable = false, columnDefinition = "text")
+    var accessToken: String,
+
+    @Column(name = "is_test", nullable = false)
+    var isTest: Boolean = false,
+
+    @Column(name = "updated_at", columnDefinition = "timestamptz")
+    var updatedAt: OffsetDateTime = OffsetDateTime.now()
+)