Liquid noob alert - completly new to shopify development.
I have always devleoped webapps in php so hopefully I should pick this up easily enough. But I am trying to figure out how to listen to POST requests to update the cart?
I am going to be using a thirdparty system to create personalised products through an iFrame on the product page. In that I need to parse a callback URL which they then send back POST request with the product details, print_ref_id etc. I need to take this callback and update the cart but have no idea how to do it.
In PHP it would be a simply if $_POST['data']. But how can I do it in liquid and what template file do i put it on?
Many thanks in advance