diff --git a/app/http/controllers/backend/app.go b/app/http/controllers/backend/app.go
index 6a66d5c..3ce31a6 100644
--- a/app/http/controllers/backend/app.go
+++ b/app/http/controllers/backend/app.go
@@ -2,6 +2,7 @@ package backend
 
 import (
 	"PaymentCenter/app/constants/errorcode"
+	"PaymentCenter/app/constants/pojo"
 	"PaymentCenter/app/http/controllers"
 	"PaymentCenter/app/http/entities"
 	"PaymentCenter/app/http/entities/backend"
@@ -62,11 +63,11 @@ func GenerateDecrypt(c *gin.Context) {
 	var publicKey, privateKey string
 	var err error
 	switch req.KeyType {
-	case "sm2":
+	case pojo.SM2:
 		publicKey, privateKey, err = sm2.GenerateSM2Key()
-	case "rsa":
+	case pojo.RSA:
 		publicKey, privateKey, err = rsa.GenerateKey()
-	case "sm4":
+	case pojo.SM4:
 		privateKey, publicKey = sm4.GenerateKey()
 	default:
 		controllers.HandCodeRes(c, "", errorcode.EncryptTypeNotFound)
diff --git a/app/http/entities/backend/app.go b/app/http/entities/backend/app.go
index 43b45f9..06f9f45 100644
--- a/app/http/entities/backend/app.go
+++ b/app/http/entities/backend/app.go
@@ -96,5 +96,5 @@ func (a *AppUpdateRequest) RequestToDb() (db appmodel.App) {
 }
 
 type GenerateDecryptKeyRequest struct {
-	KeyType string `json:"key_type" form:"key_type" label:"密钥类型"`
+	KeyType int32 `json:"key_type" form:"key_type" label:"密钥类型"`
 }
diff --git a/app/http/entities/backend/pay_channel.go b/app/http/entities/backend/pay_channel.go
index 4416175..a278b7b 100644
--- a/app/http/entities/backend/pay_channel.go
+++ b/app/http/entities/backend/pay_channel.go
@@ -27,8 +27,16 @@ func (p *PayChannelResponse) ResponseFromDb(db paychannelmodel.PayChannel) {
 	p.MerchantId = db.MerchantId
 	p.ChannelType = db.ChannelType
 	p.AppId = db.AppId
-	p.ExpireTime = db.ExpireTime.Format("2006-01-02 15:04:05")
-	p.CreateTime = db.CreateTime.Format("2006-01-02 15:04:05")
+	if db.ExpireTime.IsZero() {
+		p.ExpireTime = ""
+	} else {
+		p.ExpireTime = db.ExpireTime.Format("2006-01-02 15:04:05")
+	}
+	if db.CreateTime.IsZero() {
+		p.CreateTime = ""
+	} else {
+		p.CreateTime = db.CreateTime.Format("2006-01-02 15:04:05")
+	}
 
 	switch db.ChannelType {
 	case common.PAY_CHANNEL_WECHAT_H5, common.PAY_CHANNEL_WECHAT_JSAPI, common.PAY_CHANNEL_WECHAT_NATIVE, common.PAY_CHANNEL_WECHAT_APP, common.PAY_CHANNEL_WECHAT_MINI: