post https://vzaar.com/api/v2/signature/single/2
This signature is required for a single-part file upload. Typically this would be for smaller files or simpler file upload implementations e.g. html form post.
You can also send the optional filesize parameter, and if provided vzaar will validate that your file is an acceptable size. The maximum allowed file size for this signature is 5GB. If your file size exceeds 5GB then you must perform a multipart upload.