Prepare to handle different cases for checkout_data single value

Author: msaggiorato

includes/class-wc-gateway-amazon-payments-advanced.php

@@ -607,10 +607,14 @@ public function use_checkout_session_data_single( $ret, $input ) {
 			return $ret;
 		}
 
-		$session = $this->get_woocommerce_data();
+		switch ( $input ) {
+			default:
+				$session = $this->get_woocommerce_data();
 
-		if ( isset( $session[ $input ] ) ) {
-			return $session[ $input ];
+				if ( isset( $session[ $input ] ) ) {
+					return $session[ $input ];
+				}
+				break;
 		}
 
 		return $ret;