diff --git a/direct_billing.go b/direct_billing.go
index 3abe8b5..12e9ba2 100644
--- a/direct_billing.go
+++ b/direct_billing.go
@@ -54,7 +54,7 @@ func (d DirectBilling) GetTransactionList(serviceId, page, limit uint) (DirectBi
 	var transactionList DirectBillingTransactionListResponse
 	return transactionList, json.Unmarshal(response, &transactionList)
 }
-func (d DirectBilling) GetTransactionDetails(serviceId, transactionId uint) (DirectBillingTransactionDetailsResponse, error) {
+func (d DirectBilling) GetTransactionDetails(serviceId uint, transactionId string) (DirectBillingTransactionDetailsResponse, error) {
 	endpoint := fmt.Sprintf("/directbilling/%v/transactions/%v", serviceId, transactionId)
 	response, err := d.restClient.sendGetRequest(endpoint)
 	if err != nil {
@@ -88,7 +88,7 @@ func CheckSignature(key, transactionJson string) bool {
 		fmt.Sprintf("%f", n.Values.Partner),
 		n.Returns.Complete,
 		n.Returns.Failure,
-		n.Number,
+		n.NumberFrom,
 		fmt.Sprintf("%v", n.Provider),
 		n.Signature,
 		key,
diff --git a/model.go b/model.go
index f6a0baf..779eaf6 100644
--- a/model.go
+++ b/model.go
@@ -206,7 +206,7 @@ type CalculateCommissionResponse struct {
 type DirectBillingTransactionListResponse struct {
 	PaginatedResponse
 	TransactionList []struct {
-		Id         int     `json:"id"`
+		Id         string  `json:"id"`
 		Status     string  `json:"status"`
 		Value      float64 `json:"value"`
 		ValueNetto float64 `json:"value_netto"`
@@ -219,7 +219,7 @@ type DirectBillingTransactionListResponse struct {
 type DirectBillingTransactionDetailsResponse struct {
 	Response
 	TransactionDetails struct {
-		Id          int         `json:"id"`
+		Id          string      `json:"id"`
 		Status      string      `json:"status"`
 		PhoneNumber interface{} `json:"phoneNumber"`
 		Control     string      `json:"control"`
@@ -267,7 +267,7 @@ type DirectBillingGenerateTransactionResponse struct {
 }
 
 type DirectBillingTransactionNotification struct {
-	Id        int    `json:"id"`
+	Id        string `json:"id"`
 	ServiceId int    `json:"service_id"`
 	Status    string `json:"status"`
 	Values    struct {
@@ -279,8 +279,8 @@ type DirectBillingTransactionNotification struct {
 		Complete string `json:"complete"`
 		Failure  string `json:"failure"`
 	} `json:"returns"`
-	Control   string `json:"control"`
-	Number    string `json:"number"`
-	Provider  int    `json:"provider"`
-	Signature string `json:"Signature"`
+	Control    string `json:"control"`
+	NumberFrom string `json:"number_from"`
+	Provider   int    `json:"provider"`
+	Signature  string `json:"Signature"`
 }