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>Base64: 0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz

This is only 62 characters!

Suspect they mistyped `Base62` (since they seem to be favouring non powers of two)

Base64 uses / and +

Sometimes. Other times those chars are not allowed in the embedding context (paths, for instance), so you have to use '+' and ','. Or maybe '_' and '-'.

If you follow rfc4648, those are "base 64" but not "base64":

> This encoding [using '-' and '_'] may be referred to as "base64url"... Unless clarified otherwise, "base64" refers to the base 64 in the previous section ['+' and '/'].

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