Support overriding the default API URL

stripe.go

@@ -12,8 +12,8 @@ import (
 	"time"
 )
 
-// uri is the public Stripe URL for APIs.
-const uri = "https://api.stripe.com/v1"
+// url is the public Stripe URL for APIs.
+const defaultUrl = "https://api.stripe.com/v1"
 
 // apiversion is the currently supported API version
 const apiversion = "2014-08-20"
@@ -29,6 +29,7 @@ type Backend interface {
 
 // InternalBackend is the internal implementation for making HTTP calls to Stripe.
 type InternalBackend struct {
+	Url        string
 	HttpClient *http.Client
 }
 
@@ -48,7 +49,10 @@ func SetDebug(value bool) {
 // GetBackend returns the currently used backend in the binding.
 func GetBackend() Backend {
 	if backend == nil {
-		backend = &InternalBackend{GetHttpClient()}
+		backend = &InternalBackend{
+			Url:        defaultUrl,
+			HttpClient: GetHttpClient(),
+		}
 	}
 
 	return backend
@@ -79,7 +83,7 @@ func (s *InternalBackend) Call(method, path, token string, body *url.Values, v i
 		path = "/" + path
 	}
 
-	path = uri + path
+	path = s.Url + path
 
 	if body != nil && len(*body) > 0 {
 		path += "?" + body.Encode()