diff --git a/src/service/iospay.svr.ts b/src/service/iospay.svr.ts
index f52e343..c46c035 100644
--- a/src/service/iospay.svr.ts
+++ b/src/service/iospay.svr.ts
@@ -22,13 +22,20 @@ const ISSUER_ID = process.env.IOS_ISSUER_ID
 const APP_BUNDLE_ID = process.env.IOS_APP_BUNDLE_ID
 const environment = sandbox ? Environment.Sandbox : Environment.Production
 
-const api = new AppStoreServerAPI(KEY, KEY_ID, ISSUER_ID, APP_BUNDLE_ID, environment)
+const apiProd = new AppStoreServerAPI(KEY, KEY_ID, ISSUER_ID, APP_BUNDLE_ID, Environment.Production)
+const apiSandbox = new AppStoreServerAPI(KEY, KEY_ID, ISSUER_ID, APP_BUNDLE_ID, Environment.Sandbox)
 
 @singleton
 export class IosPaySvr {
   public async iosPayVerify(orderId: string) {
     logger.info('iosPayVerify: ', orderId)
-    const response = await api.lookupOrder(orderId)
+    let response;
+    try {
+      response = await apiProd.lookupOrder(orderId)
+    } catch (err) {
+      logger.info('iosPayVerify err: ', err)
+      response = await apiSandbox.lookupOrder(orderId)
+    }
 
     if (response.status === OrderLookupStatus.Valid) {
       const transactions = await decodeTransactions(response.signedTransactions)
@@ -44,7 +51,17 @@ export class IosPaySvr {
     if (rversion) {
       reqData['revision'] = rversion
     }
-    const response = await api.getTransactionHistory(originalTransactionId, reqData)
+    let response
+    try {
+      response = await apiProd.getTransactionHistory(originalTransactionId, reqData)
+    } catch (err) {
+      logger.info(`transaction with id ${originalTransactionId} not found in production, try sandbox`)
+      try {
+        response = await apiSandbox.getTransactionHistory(originalTransactionId, reqData)
+      } catch (errSandbox) {
+        logger.info(`transaction with id ${originalTransactionId} not found in sandbox`)
+      }
+    }
     let results: any = []
     // Decoding not only reveals the contents of the transactions but also verifies that they were signed by Apple.
     const transactions = await decodeTransactions(response.signedTransactions)
@@ -61,7 +78,21 @@ export class IosPaySvr {
   }
 
   public async getTransactionInfo(originalTransactionId: string) {
-    const response = await api.getTransactionInfo(originalTransactionId)
+    let response;
+    try {
+      response = await apiProd.getTransactionInfo(originalTransactionId)
+    } catch (err) {
+      try {
+        logger.info(`transaction with id ${originalTransactionId} not found in production, try sandbox`)
+        response = await apiSandbox.getTransactionInfo(originalTransactionId)
+      } catch (errSandbox) {
+        logger.info(`transaction with id ${originalTransactionId} not found in sandbox`)
+        throw new Error('getTransactionInfo err')
+      }
+    }
+    if (!response) {
+      throw new Error('empty transaction info') 
+    } 
     const transaction = await decodeTransaction(response.signedTransactionInfo)
     return transaction
   }
@@ -69,7 +100,7 @@ export class IosPaySvr {
   public async queryNotificationHistory() {
     // Start and end date are required.
     // The earliest supported start date is June 6th (the start of WWDC 2022).
-    const response = await api.getNotificationHistory({
+    const response = await apiProd.getNotificationHistory({
       startDate: 1690175687060, // June 6th 2022
       endDate: new Date().getTime(),
     })
@@ -85,9 +116,9 @@ export class IosPaySvr {
   }
 
   public async requestTestNotification() {
-    let resp = await api.requestTestNotification()
+    let resp = await apiSandbox.requestTestNotification()
     logger.info('requestTestNotification response: ', resp)
-    let info = await api.getTestNotificationStatus(resp.testNotificationToken)
+    let info = await apiSandbox.getTestNotificationStatus(resp.testNotificationToken)
     let decodeInfo = await decodeNotificationPayload(info.signedPayload)
     logger.info(decodeInfo)
     return decodeInfo