diff --git a/service/src/main/kotlin/com/sangdol/roomescape/payment/business/PaymentService.kt b/service/src/main/kotlin/com/sangdol/roomescape/payment/business/PaymentService.kt
index 654346f9..5bbea39f 100644
--- a/service/src/main/kotlin/com/sangdol/roomescape/payment/business/PaymentService.kt
+++ b/service/src/main/kotlin/com/sangdol/roomescape/payment/business/PaymentService.kt
@@ -1,6 +1,8 @@
 package com.sangdol.roomescape.payment.business
 
 import com.sangdol.common.persistence.TransactionExecutionUtil
+import com.sangdol.roomescape.payment.business.domain.PaymentClientError
+import com.sangdol.roomescape.payment.exception.ExternalPaymentException
 import com.sangdol.roomescape.payment.exception.PaymentErrorCode
 import com.sangdol.roomescape.payment.exception.PaymentException
 import com.sangdol.roomescape.payment.infrastructure.client.PaymentClientCancelResponse
@@ -24,27 +26,39 @@ class PaymentService(
     private val paymentWriter: PaymentWriter,
     private val transactionExecutionUtil: TransactionExecutionUtil,
 ) {
-    fun confirm(reservationId: Long, request: PaymentConfirmRequest): PaymentCreateResponse {
-        val clientConfirmResponse: PaymentClientConfirmResponse = paymentClient.confirm(
-            paymentKey = request.paymentKey,
-            orderId = request.orderId,
-            amount = request.amount,
-        )
+    fun requestConfirm(request: PaymentConfirmRequest): PaymentClientConfirmResponse {
+        try {
+            return paymentClient.confirm(request.paymentKey, request.orderId, request.amount)
+        } catch (e: ExternalPaymentException) {
+            val errorCode = if (e.httpStatusCode in 400..<500) {
+                PaymentErrorCode.PAYMENT_CLIENT_ERROR
+            } else {
+                PaymentErrorCode.PAYMENT_PROVIDER_ERROR
+            }
 
-        return transactionExecutionUtil.withNewTransaction(isReadOnly = false) {
-            val payment: PaymentEntity = paymentWriter.createPayment(
-                reservationId = reservationId,
-                paymentClientConfirmResponse = clientConfirmResponse
-            )
-            val detail: PaymentDetailEntity = paymentWriter.createDetail(clientConfirmResponse, payment.id)
+            val message = if (PaymentClientError.contains(e.errorCode)) {
+                "${errorCode.message}(${e.message})"
+            } else {
+                errorCode.message
+            }
 
-            PaymentCreateResponse(paymentId = payment.id, detailId = detail.id)
-        } ?: run {
-            log.warn { "[confirm] 결제 확정 중 예상치 못한 null 반환" }
-            throw PaymentException(PaymentErrorCode.PAYMENT_UNEXPECTED_ERROR)
+            throw PaymentException(errorCode, message)
         }
     }
 
+    fun savePayment(
+        reservationId: Long,
+        paymentConfirmResponse: PaymentClientConfirmResponse
+    ): PaymentCreateResponse {
+        val payment: PaymentEntity = paymentWriter.createPayment(
+            reservationId = reservationId,
+            paymentClientConfirmResponse = paymentConfirmResponse
+        )
+        val detail: PaymentDetailEntity = paymentWriter.createDetail(paymentConfirmResponse, payment.id)
+
+        return PaymentCreateResponse(paymentId = payment.id, detailId = detail.id)
+    }
+
     fun cancel(userId: Long, request: PaymentCancelRequest) {
         val payment: PaymentEntity = findByReservationIdOrThrow(request.reservationId)
 
diff --git a/service/src/main/kotlin/com/sangdol/roomescape/payment/docs/PaymentAPI.kt b/service/src/main/kotlin/com/sangdol/roomescape/payment/docs/PaymentAPI.kt
index 171df140..c79b1cb7 100644
--- a/service/src/main/kotlin/com/sangdol/roomescape/payment/docs/PaymentAPI.kt
+++ b/service/src/main/kotlin/com/sangdol/roomescape/payment/docs/PaymentAPI.kt
@@ -4,16 +4,15 @@ import com.sangdol.common.types.web.CommonApiResponse
 import com.sangdol.roomescape.auth.web.support.User
 import com.sangdol.roomescape.auth.web.support.UserOnly
 import com.sangdol.roomescape.common.types.CurrentUserContext
+import com.sangdol.roomescape.payment.infrastructure.client.PaymentClientConfirmResponse
 import com.sangdol.roomescape.payment.web.PaymentCancelRequest
 import com.sangdol.roomescape.payment.web.PaymentConfirmRequest
-import com.sangdol.roomescape.payment.web.PaymentCreateResponse
 import io.swagger.v3.oas.annotations.Operation
 import io.swagger.v3.oas.annotations.responses.ApiResponse
 import io.swagger.v3.oas.annotations.responses.ApiResponses
 import jakarta.validation.Valid
 import org.springframework.http.ResponseEntity
 import org.springframework.web.bind.annotation.RequestBody
-import org.springframework.web.bind.annotation.RequestParam
 
 interface PaymentAPI {
 
@@ -21,9 +20,8 @@ interface PaymentAPI {
     @Operation(summary = "결제 승인")
     @ApiResponses(ApiResponse(responseCode = "200", useReturnTypeSchema = true))
     fun confirmPayment(
-        @RequestParam(required = true) reservationId: Long,
         @Valid @RequestBody request: PaymentConfirmRequest
-    ): ResponseEntity<CommonApiResponse<PaymentCreateResponse>>
+    ): ResponseEntity<CommonApiResponse<PaymentClientConfirmResponse>>
 
     @Operation(summary = "결제 취소")
     @ApiResponses(ApiResponse(responseCode = "200", useReturnTypeSchema = true))
diff --git a/service/src/main/kotlin/com/sangdol/roomescape/payment/web/PaymentController.kt b/service/src/main/kotlin/com/sangdol/roomescape/payment/web/PaymentController.kt
index f4830f20..e4c1e6f1 100644
--- a/service/src/main/kotlin/com/sangdol/roomescape/payment/web/PaymentController.kt
+++ b/service/src/main/kotlin/com/sangdol/roomescape/payment/web/PaymentController.kt
@@ -5,6 +5,7 @@ import com.sangdol.roomescape.auth.web.support.User
 import com.sangdol.roomescape.common.types.CurrentUserContext
 import com.sangdol.roomescape.payment.business.PaymentService
 import com.sangdol.roomescape.payment.docs.PaymentAPI
+import com.sangdol.roomescape.payment.infrastructure.client.PaymentClientConfirmResponse
 import jakarta.validation.Valid
 import org.springframework.http.ResponseEntity
 import org.springframework.web.bind.annotation.*
@@ -15,12 +16,11 @@ class PaymentController(
     private val paymentService: PaymentService
 ) : PaymentAPI {
 
-    @PostMapping
+    @PostMapping("/confirm")
     override fun confirmPayment(
-        @RequestParam(required = true) reservationId: Long,
         @Valid @RequestBody request: PaymentConfirmRequest
-    ): ResponseEntity<CommonApiResponse<PaymentCreateResponse>> {
-        val response = paymentService.confirm(reservationId, request)
+    ): ResponseEntity<CommonApiResponse<PaymentClientConfirmResponse>> {
+        val response = paymentService.requestConfirm(request)
 
         return ResponseEntity.ok(CommonApiResponse(response))
     }