diff --git a/src/main/java/com/flutterwave/bean/AuthorizationModes.java b/src/main/java/com/flutterwave/bean/AuthorizationModes.java
index f26e951..5ce66df 100644
--- a/src/main/java/com/flutterwave/bean/AuthorizationModes.java
+++ b/src/main/java/com/flutterwave/bean/AuthorizationModes.java
@@ -5,5 +5,6 @@ public enum AuthorizationModes {
     AUS_NOAUTH,
     REDIRECT,
     OTP,
-    PIN
+    PIN,
+    CALLBACK
 }