Merge pull request #154 from BrightLocal/task/PS-2591-batch-callback-…

…format

PS-2591 API Batch callback with request format

source/includes/_batch.md

@@ -86,6 +86,7 @@ Parameter | Notes
 api-key | <span class="label label-required">Required</span>
 stop-on-job-error | 1 or 0. default 0. If errors are found in one job the batch will be stopped and no further jobs will be processed.
 callback | Callback URL. When a batch fails or completes the batch results will be posted to this callback URL
+callback_request_format | Request format for callback URL. Available values: `form`, `json`. Default: `form`
 
 ## Commit Batch