Fix Upload form. Refs: #43 #44

src/Client.php

@@ -1577,17 +1577,24 @@ public function getInvoiceRequests(?string $shipmentId = null, ?int $page = 1, ?
     /**
      * Uploads an invoice associated with shipment id.
      * @param string $shipmentId The id of the shipment associated with the invoice.
+     * @param string $invoice
      * @return Model\ProcessStatus|null
      * @throws Exception\ConnectException when an error occurred in the HTTP connection.
      * @throws Exception\ResponseException when an unexpected response was received.
      * @throws Exception\UnauthorizedException when the request was unauthorized.
      * @throws Exception\RateLimitException when the throttling limit has been reached for the API user.
      * @throws Exception\Exception when something unexpected went wrong.
      */
-    public function uploadInvoice(string $shipmentId): ?Model\ProcessStatus
+    public function uploadInvoice(string $shipmentId, string $invoice): ?Model\ProcessStatus
     {
         $url = "retailer/shipments/invoices/{$shipmentId}";
         $options = [
+            'multipart' => [
+                [
+                    'name' => 'invoice',
+                    'contents' => \GuzzleHttp\Psr7\Utils::tryFopen($invoice, 'r'),
+                ],
+            ],
             'produces' => 'application/vnd.retailer.v10+json',
             'consumes' => 'application/json',
         ];

src/OpenApi/ClientGenerator.php

@@ -344,7 +344,7 @@ protected function extractArguments(array $methodDefinition): array
                 }
 
                 $argsWithoutDefault[] = $argument;
-            } elseif (array_key_first($methodDefinition['requestBody']['content']) == 'multipart/form-data') {
+            } else {
                 foreach ($requestBody['schema']['properties'] as $propName => $property) {
                     $argument = [
                         'default' => null,