diff --git a/.gitignore b/.gitignore
index 723ef36..92c16db 100644
--- a/.gitignore
+++ b/.gitignore
@@ -1 +1,2 @@
-.idea
\ No newline at end of file
+.idea
+main
\ No newline at end of file
diff --git a/.travis.yml b/.travis.yml
index a469c0b..d6e4111 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -4,6 +4,8 @@ go:
   - "1.8.x"
   - "1.9.x"
   - "1.10.x"
+  - "1.11.x"
+  - "1.12.x"
 
 script: 
   - go test ./...
diff --git a/go.mod b/go.mod
new file mode 100644
index 0000000..1a388e4
--- /dev/null
+++ b/go.mod
@@ -0,0 +1,5 @@
+module github.com/veritrans/go-midtrans
+
+go 1.12
+
+require github.com/cheekybits/is v0.0.0-20150225183255-68e9c0620927
diff --git a/go.sum b/go.sum
new file mode 100644
index 0000000..7187f04
--- /dev/null
+++ b/go.sum
@@ -0,0 +1,3 @@
+github.com/cheekybits/is v0.0.0-20150225183255-68e9c0620927 h1:SKI1/fuSdodxmNNyVBR8d7X/HuLnRpvvFO0AgyQk764=
+github.com/cheekybits/is v0.0.0-20150225183255-68e9c0620927/go.mod h1:h/aW8ynjgkuj+NQRlZcDbAbM1ORAbXjXX77sX7T289U=
+github.com/veritrans/go-midtrans v0.0.0-20180710074703-234c054b1e86/go.mod h1:21mwYsDK+z+5kR2fvUB8n2yijZZm504Vjzk1s0rNQJg=
diff --git a/request.go b/request.go
index 4030fc2..cb341e6 100644
--- a/request.go
+++ b/request.go
@@ -2,13 +2,13 @@ package midtrans
 
 // ItemDetail : Represent the transaction details
 type ItemDetail struct {
-	ID           string `json:"id"`
-	Name         string `json:"name"`
-	Price        int64  `json:"price"`
-	Qty          int32  `json:"quantity"`
-	Brand        string `json:"brand,omitempty"`
-	Category     string `json:"category,omitempty"`
-	MerchantName string `json:"merchant_name,omitempty"`
+	ID           string  `json:"id"`
+	Name         string  `json:"name"`
+	Price        float64 `json:"price"`
+	Qty          int32   `json:"quantity"`
+	Brand        string  `json:"brand,omitempty"`
+	Category     string  `json:"category,omitempty"`
+	MerchantName string  `json:"merchant_name,omitempty"`
 }
 
 // CustAddress : Represent the customer address
@@ -38,15 +38,16 @@ type CustDetail struct {
 
 // TransactionDetails : Represent transaction details
 type TransactionDetails struct {
-	OrderID  string `json:"order_id"`
-	GrossAmt int64  `json:"gross_amount"`
+	Currency string  `json:"currency"`
+	OrderID  string  `json:"order_id"`
+	GrossAmt float64 `json:"gross_amount"`
 }
 
 // ExpiryDetail : Represent SNAP expiry details
 type ExpiryDetail struct {
-	StartTime   string `json:"start_time,omitempty"`
-	Unit        string `json:"unit"`
-	Duration    int64  `json:"duration"`
+	StartTime string `json:"start_time,omitempty"`
+	Unit      string `json:"unit"`
+	Duration  int64  `json:"duration"`
 }
 
 // CreditCardDetail : Represent credit card detail
@@ -54,13 +55,15 @@ type CreditCardDetail struct {
 	Secure          bool     `json:"secure,omitempty"`
 	TokenID         string   `json:"token_id"`
 	Bank            string   `json:"bank,omitempty"`
+	Channel         string   `json:"channel,omitempty"`
 	Bins            []string `json:"bins,omitempty"`
 	InstallmentTerm int8     `json:"installment_term,omitempty"`
 	Type            string   `json:"type,omitempty"`
 	// indicate if generated token should be saved for next charge
 	SaveTokenID          bool   `json:"save_token_id,omitempty"`
 	SavedTokenIDExpireAt string `json:"saved_token_id_expired_at,omitempty"`
-	Authentication bool `json:"authentication,omitempty"`
+	SaveCard             bool   `json:"save_card,omitempty"`
+	Authentication       string `json:"authentication,omitempty"`
 }
 
 // PermataBankTransferDetail : Represent Permata bank_transfer detail
@@ -192,6 +195,7 @@ type ChargeReq struct {
 	Gopay                         *GopayDetail                   `json:"gopay,omitempty"`
 
 	Items      *[]ItemDetail `json:"item_details,omitempty"`
+	UserID     string        `json:"user_id"`
 	CustField1 string        `json:"custom_field1,omitempty"`
 	CustField2 string        `json:"custom_field2,omitempty"`
 	CustField3 string        `json:"custom_field3,omitempty"`
diff --git a/snap.go b/snap.go
index 4254277..702de15 100644
--- a/snap.go
+++ b/snap.go
@@ -23,7 +23,7 @@ func (gateway *SnapGateway) Call(method, path string, body io.Reader, v interfac
 }
 
 // GetTokenQuick : Quickly get token without constructing the body manually
-func (gateway *SnapGateway) GetTokenQuick(orderID string, grossAmount int64) (SnapResponse, error) {
+func (gateway *SnapGateway) GetTokenQuick(orderID string, grossAmount float64) (SnapResponse, error) {
 	return gateway.GetToken(&SnapReq{
 		TransactionDetails: TransactionDetails{
 			OrderID:  orderID,