diff --git a/src/main/kotlin/roomescape/payment/infrastructure/client/v2/TosspaymentCancelDTO.kt b/src/main/kotlin/roomescape/payment/infrastructure/client/v2/TosspaymentCancelDTO.kt
index cb7d535b..57d440e2 100644
--- a/src/main/kotlin/roomescape/payment/infrastructure/client/v2/TosspaymentCancelDTO.kt
+++ b/src/main/kotlin/roomescape/payment/infrastructure/client/v2/TosspaymentCancelDTO.kt
@@ -6,6 +6,8 @@ import com.fasterxml.jackson.databind.JsonDeserializer
 import com.fasterxml.jackson.databind.JsonNode
 import com.fasterxml.jackson.databind.annotation.JsonDeserialize
 import roomescape.payment.infrastructure.common.PaymentStatus
+import roomescape.payment.infrastructure.persistence.v2.CanceledPaymentEntityV2
+import java.time.LocalDateTime
 import java.time.OffsetDateTime
 
 data class PaymentCancelRequestV2(
@@ -26,6 +28,25 @@ data class CancelDetail(
     val transferDiscountAmount: Int,
     val easyPayDiscountAmount: Int,
     val canceledAt: OffsetDateTime,
+    val cancelReason: String
+)
+
+fun CancelDetail.toEntity(
+    id: Long,
+    paymentId: Long,
+    canceledBy: Long,
+    cancelRequestedAt: LocalDateTime
+) = CanceledPaymentEntityV2(
+    id = id,
+    canceledAt = this.canceledAt,
+    requestedAt = cancelRequestedAt,
+    paymentId = paymentId,
+    canceledBy = canceledBy,
+    cancelReason = this.cancelReason,
+    cancelAmount = this.cancelAmount,
+    cardDiscountAmount = this.cardDiscountAmount,
+    transferDiscountAmount = this.transferDiscountAmount,
+    easypayDiscountAmount = this.easyPayDiscountAmount
 )
 
 class CancelDetailDeserializer : JsonDeserializer<CancelDetail>() {
@@ -46,7 +67,8 @@ class CancelDetailDeserializer : JsonDeserializer<CancelDetail>() {
             cardDiscountAmount = targetNode.get("cardDiscountAmount").asInt(),
             transferDiscountAmount = targetNode.get("transferDiscountAmount").asInt(),
             easyPayDiscountAmount = targetNode.get("easyPayDiscountAmount").asInt(),
-            canceledAt = OffsetDateTime.parse(targetNode.get("canceledAt").asText())
+            canceledAt = OffsetDateTime.parse(targetNode.get("canceledAt").asText()),
+            cancelReason = targetNode.get("cancelReason").asText()
         )
     }
 }
diff --git a/src/main/kotlin/roomescape/payment/infrastructure/client/v2/TosspaymentConfirmDTO.kt b/src/main/kotlin/roomescape/payment/infrastructure/client/v2/TosspaymentConfirmDTO.kt
index 819ac4b4..0c5a3ce8 100644
--- a/src/main/kotlin/roomescape/payment/infrastructure/client/v2/TosspaymentConfirmDTO.kt
+++ b/src/main/kotlin/roomescape/payment/infrastructure/client/v2/TosspaymentConfirmDTO.kt
@@ -12,7 +12,7 @@ import java.time.OffsetDateTime
 data class PaymentConfirmRequest(
     val paymentKey: String,
     val orderId: String,
-    val amount: Long,
+    val amount: Int,
 )
 
 data class PaymentConfirmResponse(
diff --git a/src/main/kotlin/roomescape/reservation/web/ReservationWithPaymentDTO.kt b/src/main/kotlin/roomescape/reservation/web/ReservationWithPaymentDTO.kt
index 466765d6..07b2a444 100644
--- a/src/main/kotlin/roomescape/reservation/web/ReservationWithPaymentDTO.kt
+++ b/src/main/kotlin/roomescape/reservation/web/ReservationWithPaymentDTO.kt
@@ -6,6 +6,7 @@ import roomescape.payment.infrastructure.common.PaymentType
 import roomescape.reservation.infrastructure.persistence.ReservationEntity
 import roomescape.reservation.infrastructure.persistence.ReservationStatus
 import java.time.LocalDate
+import java.time.LocalDateTime
 import java.time.LocalTime
 
 data class ReservationCreateRequest(
@@ -33,7 +34,7 @@ fun ReservationEntity.toCreateResponseV2() = ReservationCreateResponseV2(
 data class ReservationPaymentRequest(
     val paymentKey: String,
     val orderId: String,
-    val amount: Long,
+    val amount: Int,
     val paymentType: PaymentType
 )
 
@@ -51,5 +52,6 @@ data class ReservationPaymentResponse(
 )
 
 data class ReservationCancelRequest(
-    val cancelReason: String
+    val cancelReason: String,
+    val requestedAt: LocalDateTime = LocalDateTime.now()
 )