diff --git a/platform/elmapi/callback.go b/platform/elmapi/callback.go
index 5e5c7dfc..adafc899 100644
--- a/platform/elmapi/callback.go
+++ b/platform/elmapi/callback.go
@@ -1,7 +1,7 @@
 package elmapi
 
 const (
-	OrderEffective    = 10
+	OrderValid        = 10
 	MerchantValid     = 12
 	OrderCanceled     = 14
 	MerchantInvalid   = 15
@@ -23,3 +23,7 @@ type ELMCallbackMsg struct {
 	UserId    int64  `json:"userId"`
 	Signature string `json:"signature"`
 }
+
+var (
+	ELMResponseOK = &ELMCallbackResponse{"ok"}
+)
diff --git a/platform/elmapi/order.go b/platform/elmapi/order.go
index 021c8659..ed3729e6 100644
--- a/platform/elmapi/order.go
+++ b/platform/elmapi/order.go
@@ -1,13 +1,23 @@
 package elmapi
 
+const (
+	ELMOrderStatusPending     = "pending"
+	ELMOrderStatusUnprocessed = "unprocessed"
+	ELMOrderStatusRefunding   = "refunding"
+	ELMOrderStatusValid       = "valid"
+	ELMOrderStatusInvalid     = "invalid"
+	ELMOrderStatusSettled     = "settled"
+)
+
 func (e *ELMAPI) GetOrder(orderId string) (map[string]interface{}, error) {
 	result, err := e.AccessELM("eleme.order.getOrder", map[string]interface{}{
 		"orderId": orderId,
 	})
 
 	if err == nil {
-		innerResult := map[string]interface{}(result.Result.(map[string]interface{}))
+		innerResult := result.Result.(map[string]interface{})
 		return innerResult, nil
 	}
+
 	return nil, err
 }