How do I add a product and promo code to a URL?

roundabout
Shopify Partner
18 0 3
Hey all,
by now i was not able to create a link that ads the product to the cart including a promo code that sets the product value to zero. The very tricky part is to make the link going to the cart view and not initiate check out instantly........
 
i got that far now: ttp://soeder.XY.com/cart/32833043595367&quantity=1?checkout[reduction_code]=XY
 
IS THERE ANYTHING WRONG ????
R
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