/**
  * @param string $retailer_id
  * @param int $catalog_id
  * @return string
  */
 public static function buildCatalogUrlForRetailerId($retailer_id, $catalog_id)
 {
     return '/catalog:' . $catalog_id . ':' . Api::base64UrlEncode($retailer_id);
 }
 public function testBase64UrlEncode()
 {
     $this->assertEquals('MTIzNDU', Api::base64UrlEncode('12345'));
 }