404
checkout.link_not_foundcheckoutNo such payment link
Returned by the implementation; no specification rule declares it yet.
The link id or token does not name a link for this tenant and mode.
Why the API refuses
payment link not found
What to do
Check the mode, and check you are using the link's token rather than its internal id in a payer-facing URL (they are different values on purpose — the token is the capability, the id is the record).