code: function defaultApikey(apikey) {
      if (typeof apikey !== 'undefined') {
          if (typeof apikey !== 'string') {
              throw new TypeError('`apikey` argument must be a string');
          }
  
          if (apikey.length !== 24) {
              throw new TypeError('`apikey` argument must be 24 characters long');
          }
  
          return apikey;
      }
      throw new TypeError('Gandi client needs an apikey as a first argument');
  }
docs: Returns apikey to constructor after some validation.
  
  @param {string} apikey - Apikey passed onto the constructor.
  @private