Download an invitation template's logo

Downloads a template’s stored logo, verbatim, under its stored MIME type (image/png: the logo is checked to be a PNG when it is saved). This is the image the card carries when the template has one; has_logo on the template says whether there is one to fetch.

Errors

• HTTP 404 code 2056: the template is yours and carries no logo.
• HTTP 404 code 2033: unknown ids, and another brand’s, exactly as the template read answers them.