Update quantity for specific product

Hi,

I’m using a plus and minus buttons on the product page to update the product quantity in cart using ajax.

I was able to do the plus by calling the “?post_type=product&add-to-cart=productID” link.

But I have no clue what to do for the minus thing. Is there a function or something where I can pass the product ID and adjust the quantity in cart?

Thanks

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