Everywhere on the forum its mentioned that URL in cards response is not supported.
However, while playing spotify on my echo device I realized, it sends a card with URL in it as seen in the picture below:
The documentation here https://developer.amazon.com/docs/custom-skills/include-a-card-in-your-skills-response.html#overview-of-cards still mentions Simple, Standard, LinkAccount and AskForPermissionConsent cards, no information available on how to generate a card like above.
The "GO TO SPOTIFY APP" is a clickable url.
Can you please update the documentation if its stale?