async function getAccessToken (ctx) {
  try {
    let resp = await auth.getAccessToken(ctx.request.body)
    ctx.response.status = 200
    ctx.response.type = 'text/plain'
    ctx.response.body = resp
  } catch (e) {
    console.error('\n> Could not obtain token\n' + e)
    process.exit(1)
  }
}
[getAccessToken description]
@param  {[type]} ctx [description]
@return {[type]}     [description]