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@franziska
You can show them the URL http://franziskaebert.de/wp-json/wp/v2/posts/1
And @sk what is your website address?
Maybe you can send them the same URL with just your domain in place.
Hi @Satisfied-Fool not sure how multisite plugins work. But I assume that you need a key for every website you do. So also for a subdomain multisite.
All the best!
Marius