Bobby Norton
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Hello, To create a link for a product upgrade in WHMCS, append the client 's ID and the desired target products ID as parameters to the URL. For example: `https://yourwhmcsdomain.com/cart.php?a=upgrade&pid=target_product_id&id=client_id`. Replace `yourwhmcsdomain.com`, `target_product_id` and `client_id` with actual values.