code: function getRecaptchaResponse(field, req) {
    return req.get(field) || (req.query && req.query[field]) || (req.body && req.body[field])
  }
docs: Gets recaptcha response from request.
  @private
  @param {string} field - Key to look for response.
  @param {express.req} req - Request object.
  @returns {string} - Recaptcha response.