diff --git a/service/src/main/kotlin/com/sangdol/roomescape/order/business/OrderPostProcessorService.kt b/service/src/main/kotlin/com/sangdol/roomescape/order/business/OrderPostProcessorService.kt
new file mode 100644
index 00000000..ccd7c9b9
--- /dev/null
+++ b/service/src/main/kotlin/com/sangdol/roomescape/order/business/OrderPostProcessorService.kt
@@ -0,0 +1,60 @@
+package com.sangdol.roomescape.order.business
+
+import com.sangdol.common.persistence.IDGenerator
+import com.sangdol.common.persistence.TransactionExecutionUtil
+import com.sangdol.roomescape.order.infrastructure.persistence.PostOrderTaskEntity
+import com.sangdol.roomescape.order.infrastructure.persistence.PostOrderTaskRepository
+import com.sangdol.roomescape.payment.business.PaymentService
+import com.sangdol.roomescape.payment.dto.PaymentGatewayResponse
+import com.sangdol.roomescape.reservation.business.ReservationService
+import io.github.oshai.kotlinlogging.KLogger
+import io.github.oshai.kotlinlogging.KotlinLogging
+import org.springframework.stereotype.Service
+import org.springframework.transaction.annotation.Propagation
+import org.springframework.transaction.annotation.Transactional
+import java.time.Instant
+
+private val log: KLogger = KotlinLogging.logger {}
+
+@Service
+class OrderPostProcessorService(
+    private val idGenerator: IDGenerator,
+    private val reservationService: ReservationService,
+    private val paymentService: PaymentService,
+    private val postOrderTaskRepository: PostOrderTaskRepository,
+    private val transactionExecutionUtil: TransactionExecutionUtil
+) {
+    @Transactional(propagation = Propagation.REQUIRES_NEW)
+    fun processAfterPaymentConfirmation(
+        reservationId: Long,
+        paymentResponse: PaymentGatewayResponse
+    ) {
+        val paymentKey = paymentResponse.paymentKey
+        try {
+            log.info { "[processAfterPaymentConfirmation] 결제 정보 저장 및 예약 확정 처리 시작: reservationId=${reservationId}, paymentKey=${paymentKey}" }
+
+            val paymentCreateResponse = paymentService.savePayment(reservationId, paymentResponse)
+            reservationService.confirmReservation(reservationId)
+
+            log.info {
+                "[processAfterPaymentConfirmation] 결제 정보 저장 및 예약 확정 처리 완료: reservationId=${reservationId}, paymentKey=${paymentKey}, paymentId=${paymentCreateResponse.paymentId}, paymentDetailId=${paymentCreateResponse.detailId}"
+            }
+        } catch (_: Exception) {
+            log.warn { "[processAfterPaymentConfirmation] 결제 정보 저장 및 예약 확정 처리 실패. 작업 저장 시작: reservationId=${reservationId}, paymentKey=$paymentKey}" }
+
+            transactionExecutionUtil.withNewTransaction(isReadOnly = false) {
+                PostOrderTaskEntity(
+                    id = idGenerator.create(),
+                    reservationId = reservationId,
+                    paymentKey = paymentKey,
+                    trial = 1,
+                    nextRetryAt = Instant.now().plusSeconds(30),
+                ).also {
+                    postOrderTaskRepository.save(it)
+                }
+            }
+
+            log.info { "[processAfterPaymentConfirmation] 작업 저장 완료" }
+        }
+    }
+}