POST https://api.brandmovers.com/v1/transcriptions
--------------------------------------------------
{
    access_token: asdfghjklzxcvbnm1234567890,
    ruleset: RSqwertyuiopasdfghj,
    type: pdf,
    payload: {
        pdf_url: http://url.com/to/the/file.pdf,
        data: {
            optional: data,
            ...
        }
    },
    metadata: {...},
    options: {
        webhook: http://optional.com/endpoint,
        ...
    },
}