All checkout pages (renewal, payment, or adding more seats) are sharable. However, the person you share the page with must have a Codecademy account.
If you need to share the checkout page with someone in your organization who does not have a Codecademy account you can give them a Admin only account. Admin only roles can be added via the Admin Dashboard. Adding a Admin only does not use any of your paid user seats.
You can also see if you can generate a pre-purchase invoice to send to your billing team. More information on these invoices can be found here.