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in stock status search filter

Posted: Sun Jan 28, 2018 10:36 pm
by chenpiaw
i need to search a filter custom field from product which is
/index.php?route=product/search&search=w&category_id=25&in_stock_id=7

can anybody how to add custom filter in product search page ?
please help ;
im 2.3.0.2 OC

thANKS everyone