key

The S3 key prefix that defines the storage location of your media files. The prefix works like a folder path in S3, and is combined with the WhatsApp mediaId to create the final file path.

For example, if a media file's WhatsApp mediaId is 123.ogg, and the key is audio/example.ogg, the final file path is audio/example.ogg123.ogg.

For the same mediaId, a key of audio/ results in the file path audio/123.ogg.