From 137adbc707ed914121f3b725860498315e3cc35e Mon Sep 17 00:00:00 2001
From: Olivier Bellone <ob@stripe.com>
Date: Thu, 4 Apr 2019 23:24:35 -0700
Subject: [PATCH] Fix encoding of nested parameters in multipart requests

---
 lib/File.php | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/lib/File.php b/lib/File.php
index ae4253d539..c4d3b68a7f 100644
--- a/lib/File.php
+++ b/lib/File.php
@@ -50,6 +50,9 @@ public static function create($params = null, $options = null)
         if (is_null($opts->apiBase)) {
             $opts->apiBase = Stripe::$apiUploadBase;
         }
+        // Manually flatten params, otherwise curl's multipart encoder will
+        // choke on nested arrays.
+        $params = array_column(\Stripe\Util\Util::flattenParams($params), 1, 0);
         return static::_create($params, $opts);
     }
 }