diff --git a/auth.go b/auth.go
index 526c16e..5beada8 100644
--- a/auth.go
+++ b/auth.go
@@ -20,7 +20,7 @@ func (c *Client) GetAuthorizationCodeURL(redirectURI string, scopes []string) (s
 		scopes = []string{"profile", "email"}
 	}
 
-	return c.APIBase + "/webapps/auth/protocol/openidconnect/v1/authorize?client_id=" +
+	return strings.Replace(c.APIBase, "api.", "", -1) + "/webapps/auth/protocol/openidconnect/v1/authorize?client_id=" +
 		url.QueryEscape(c.ClientID) + "&response_type=code&scope=" + strings.Join(scopes, "+") +
 		"&redirect_uri=" + url.QueryEscape(redirectURI), nil
 }
diff --git a/auth_test.go b/auth_test.go
index 031c40f..4cadc5c 100644
--- a/auth_test.go
+++ b/auth_test.go
@@ -13,13 +13,13 @@ func TestGetAuthorizationCodeURL(t *testing.T) {
 	}
 
 	uri, err := c.GetAuthorizationCodeURL("test", []string{})
-	if uri != "https://api.sandbox.paypal.com/webapps/auth/protocol/openidconnect/v1/authorize?client_id=clid&response_type=code&scope=profile+email&redirect_uri=test" {
-		t.Errorf("GetAuthorizationCodeURL returns incorrect value for redirectURI=test")
+	if uri != "https://sandbox.paypal.com/webapps/auth/protocol/openidconnect/v1/authorize?client_id=clid&response_type=code&scope=profile+email&redirect_uri=test" {
+		t.Errorf("GetAuthorizationCodeURL returns incorrect value for redirectURI=test " + uri)
 	}
 
 	uri, err = c.GetAuthorizationCodeURL("test", []string{"address"})
-	if uri != "https://api.sandbox.paypal.com/webapps/auth/protocol/openidconnect/v1/authorize?client_id=clid&response_type=code&scope=address&redirect_uri=test" {
-		t.Errorf("GetAuthorizationCodeURL returns incorrect value for redirectURI=test and scope=address")
+	if uri != "https://sandbox.paypal.com/webapps/auth/protocol/openidconnect/v1/authorize?client_id=clid&response_type=code&scope=address&redirect_uri=test" {
+		t.Errorf("GetAuthorizationCodeURL returns incorrect value for redirectURI=test and scope=address " + uri)
 	}
 }