feat: 결제 취소시 필요한 할인금액, 결제금액을 불러오기 위한 테이블 및 Entity 정의

tosspay-mock/src/main/kotlin/com/sangdol/tosspaymock/infrastructure/persistence/OrderAmountEntity.kt

@@ -0,0 +1,24 @@
+package com.sangdol.tosspaymock.infrastructure.persistence
+
+import com.sangdol.common.persistence.PersistableBaseEntity
+import jakarta.persistence.Column
+import jakarta.persistence.Entity
+import jakarta.persistence.Table
+
+@Entity
+@Table(name = "order_amount")
+class OrderAmountEntity(
+    id: Long,
+
+    @Column(unique = true)
+    val paymentKey: String,
+
+    val approvedAmount: Int,
+    val easypayDiscountAmount: Int,
+    val cardDiscountAmount: Int,
+    val transferDiscountAmount: Int
+) : PersistableBaseEntity(id) {
+    fun totalAmount(): Int {
+        return (approvedAmount + easypayDiscountAmount + cardDiscountAmount + transferDiscountAmount)
+    }
+}

tosspay-mock/src/main/kotlin/com/sangdol/tosspaymock/infrastructure/persistence/OrderAmountRepository.kt

@@ -0,0 +1,8 @@
+package com.sangdol.tosspaymock.infrastructure.persistence
+
+import org.springframework.data.jpa.repository.JpaRepository
+
+interface OrderAmountRepository : JpaRepository<OrderAmountEntity, Long> {
+
+    fun findByPaymentKey(paymentKey: String): OrderAmountEntity?
+}

tosspay-mock/src/main/resources/schema/schema-h2.sql

@@ -0,0 +1,10 @@
+create table if not exists order_amount (
+    id                           bigint        primary key,
+    payment_key                  varchar(255)  not null,
+    approved_amount              integer       not null,
+    easypay_discount_amount      integer       not null,
+    card_discount_amount         integer       not null,
+    transfer_discount_amount     integer       not null,
+
+    constraint uk_order_amount__payment_key unique (payment_key)
+);