diff --git a/service/src/main/kotlin/com/sangdol/roomescape/payment/business/domain/PaymentDetail.kt b/service/src/main/kotlin/com/sangdol/roomescape/payment/business/domain/PaymentDetail.kt
new file mode 100644
index 00000000..65193b04
--- /dev/null
+++ b/service/src/main/kotlin/com/sangdol/roomescape/payment/business/domain/PaymentDetail.kt
@@ -0,0 +1,38 @@
+package com.sangdol.roomescape.payment.business.domain
+
+abstract class PaymentDetail
+
+class BankTransferPaymentDetail(
+    val bankCode: BankCode,
+    val settlementStatus: String,
+): PaymentDetail()
+
+class CardPaymentDetail(
+    val issuerCode: CardIssuerCode,
+    val number: String,
+    val amount: Int,
+    val cardType: CardType,
+    val ownerType: CardOwnerType,
+    val isInterestFree: Boolean,
+    val approveNo: String,
+    val installmentPlanMonths: Int
+): PaymentDetail()
+
+class EasypayCardPaymentDetail(
+    val issuerCode: CardIssuerCode,
+    val number: String,
+    val amount: Int,
+    val cardType: CardType,
+    val ownerType: CardOwnerType,
+    val isInterestFree: Boolean,
+    val approveNo: String,
+    val installmentPlanMonths: Int,
+    val easypayProvider: EasyPayCompanyCode,
+    val easypayDiscountAmount: Int,
+): PaymentDetail()
+
+class EasypayPrepaidPaymentDetail(
+    val provider: EasyPayCompanyCode,
+    val amount: Int,
+    val discountAmount: Int,
+): PaymentDetail()
diff --git a/service/src/main/kotlin/com/sangdol/roomescape/payment/mapper/PaymentDetailMappingExtensions.kt b/service/src/main/kotlin/com/sangdol/roomescape/payment/mapper/PaymentDetailMappingExtensions.kt
new file mode 100644
index 00000000..a8ae3571
--- /dev/null
+++ b/service/src/main/kotlin/com/sangdol/roomescape/payment/mapper/PaymentDetailMappingExtensions.kt
@@ -0,0 +1,91 @@
+package com.sangdol.roomescape.payment.mapper
+
+import com.sangdol.roomescape.payment.business.domain.BankTransferPaymentDetail
+import com.sangdol.roomescape.payment.business.domain.CardPaymentDetail
+import com.sangdol.roomescape.payment.business.domain.EasypayCardPaymentDetail
+import com.sangdol.roomescape.payment.business.domain.EasypayPrepaidPaymentDetail
+import com.sangdol.roomescape.payment.infrastructure.persistence.PaymentBankTransferDetailEntity
+import com.sangdol.roomescape.payment.infrastructure.persistence.PaymentCardDetailEntity
+import com.sangdol.roomescape.payment.infrastructure.persistence.PaymentDetailEntity
+import com.sangdol.roomescape.payment.infrastructure.persistence.PaymentEasypayPrepaidDetailEntity
+
+fun BankTransferPaymentDetail.toEntity(
+    id: Long,
+    paymentId: Long,
+    suppliedAmount: Int,
+    vat: Int
+): PaymentDetailEntity {
+    return PaymentBankTransferDetailEntity(
+        id = id,
+        paymentId = paymentId,
+        suppliedAmount = suppliedAmount,
+        vat = vat,
+        bankCode = this.bankCode,
+        settlementStatus = this.settlementStatus
+    )
+}
+
+fun CardPaymentDetail.toEntity(
+    id: Long,
+    paymentId: Long,
+    suppliedAmount: Int,
+    vat: Int
+): PaymentDetailEntity {
+    return PaymentCardDetailEntity(
+        id = id,
+        paymentId = paymentId,
+        suppliedAmount = suppliedAmount,
+        vat = vat,
+        issuerCode = issuerCode,
+        cardType = cardType,
+        ownerType = ownerType,
+        amount = amount,
+        cardNumber = this.number,
+        approvalNumber = this.approveNo,
+        installmentPlanMonths = installmentPlanMonths,
+        isInterestFree = isInterestFree,
+        easypayProviderCode = null,
+        easypayDiscountAmount = null
+    )
+}
+
+fun EasypayCardPaymentDetail.toEntity(
+    id: Long,
+    paymentId: Long,
+    suppliedAmount: Int,
+    vat: Int
+): PaymentDetailEntity {
+    return PaymentCardDetailEntity(
+        id = id,
+        paymentId = paymentId,
+        suppliedAmount = suppliedAmount,
+        vat = vat,
+        issuerCode = issuerCode,
+        cardType = cardType,
+        ownerType = ownerType,
+        amount = amount,
+        cardNumber = this.number,
+        approvalNumber = this.approveNo,
+        installmentPlanMonths = installmentPlanMonths,
+        isInterestFree = isInterestFree,
+        easypayProviderCode = this.easypayProvider,
+        easypayDiscountAmount = this.easypayDiscountAmount
+    )
+}
+
+fun EasypayPrepaidPaymentDetail.toEntity(
+    id: Long,
+    paymentId: Long,
+    suppliedAmount: Int,
+    vat: Int
+): PaymentDetailEntity {
+    return PaymentEasypayPrepaidDetailEntity(
+        id = id,
+        paymentId = paymentId,
+        suppliedAmount = suppliedAmount,
+        vat = vat,
+        easypayProviderCode = this.provider,
+        amount = this.amount,
+        discountAmount = this.discountAmount
+    )
+}