Conceptually, authentication works the same as with typical web APIs. Instead of passing a token through a cookie or an HTTP header, you pass it through a static class attribute. You can find an example of implementation here: github.com/layrjs/react-layr-realw...
About security concerns, you can expose your Layr backend through HTTPS.
For further actions, you may consider blocking this person and/or reporting abuse
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Conceptually, authentication works the same as with typical web APIs. Instead of passing a token through a cookie or an HTTP header, you pass it through a static class attribute. You can find an example of implementation here: github.com/layrjs/react-layr-realw...
About security concerns, you can expose your Layr backend through HTTPS.