[Gioacchino]

Hello,

the test you did with Swagger UI directly from the API reference doesn't work because it points to the wrong domain, that is https://www.thenewsletterplugin.com. To test API in localhost without HTTPS you need to set define ('NEWSLETTER_REST_ALLOW_NON_HTTPS_REQUEST', true); in wp-config.php. Here you can find the updated documentation.

Kind regards,
Gioacchino

[Author]

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