diff --git a/woocommerce-gateway-cybersource/custom-developer-id.php b/woocommerce-gateway-cybersource/custom-developer-id.php
new file mode 100644
index 0000000..b3fcf25
--- /dev/null
+++ b/woocommerce-gateway-cybersource/custom-developer-id.php
@@ -0,0 +1,12 @@
+<?php // only copy this line if needed
+
+/**
+ * Add a custom developer ID for API requests.
+ *
+ * Requires Cybersource v2.3.0+
+ */
+add_filter( 'wc_cybersource_api_developer_id', function() {
+
+	return 'your-developer-id'; // replace with the ID given to you by Cybersource
+	
+} );