Your documentation appears to be out of date. The interface on the website is very confusing. On the routstr.com/topup page says enter your API key and enter a cashu token, when I believe that the cashu token is the API key, it doesn't make sense. The documentation says go to routstr.com/tokens when that page does not exist. There's a fundamental concept that is not being communicated on the website. There are cashU tokens, there are API keys, there are lightning invoices, there's API configurations, but there's also no way to actually buy a token and there is no way to "get" an API key, and there are no examples of how to use routstr.