OK so here’s how I solved it in the end. A quick and dirty example, uses JQuery.
1 2 3 4 5 6 7 8 9 10 11 12 13 14 | <a id="buy" href="#">Buy this!</a> <script> $('#buy').click(function(e) { e.preventDefault(); addToCart(19); return false; }); function addToCart(p_id) { $.get('/wp/?post_type=product&add-to-cart=' + p_id, function() { // call back }); } </script> |
This just makes an AJAX GET request to the cart url
1 | /wp/?post_type=product&add-to-cart=[PRODUCT_ID] |
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