Hello Jan, when I used Mindee then comes this error. But I have a subscription, with postman it works.
I just tested the node and for me it works fine. Both for “receipt” and “invoice”.
The only way for me to get exactly the same error message you did post, is when I send invalid credentials like if I for example adding an X. So I assume that the credentials you did enter in n8n are invalid after all.
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