diff --git a/src/PaymentDetails.php b/src/PaymentDetails.php
index 61a07a8..988b3d6 100644
--- a/src/PaymentDetails.php
+++ b/src/PaymentDetails.php
@@ -29,7 +29,9 @@ public static function from_json( $method, $json ) {
 
 		$details = new PaymentDetails();
 
-		foreach ( $json as $key => $value ) {
+		$data = (array) $json;
+
+		foreach ( $data as $key => $value ) {
 			$details->{$key} = $value;
 		}