What could be causing checkout link errors in my online store?

Hi,

Please may I request some assistance. We have been having issues with our Checkout over the last couple of days.

The latest is an issue with the checkout link. When we send a customer a checkout link from a draft order, we get the attached error messages resulting in abandoned orders :face_with_crossed_out_eyes: .

We tested the site and it’s loading. Any thoughts on what might be the issue?