code: function authorizationHeaderParams (data) {
    var keys = Object.keys(data).sort()
    var encoded = ''
  
    keys.forEach(function (key, i) {
      encoded += key
      encoded += '="'
      encoded += encodeOAuthData(data[key])
      encoded += '"'
      if (i < keys.length - 1) {
        encoded += ', '
      }
    })
  
    return encoded
  }
docs: Authorization Header Params
  https://tools.ietf.org/html/rfc5849#section-3.5.1