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I suddenly get the response "API key not passed" from my sendy installation in my frontend. It worked correctly for months.
I checked List id and it matches the one in Sendy.
Even with the curl command I get the same response:
curl -X POST -F 'name=NAME' -F 'email=EMAIL' -F 'list=LISTID' https://sendy.....com/subscribe
Can anybody point me to a potential problem?
From version 188.8.131.52 onwards, your API key is required when calling the 'subscribe' API.
Ben, thank you. This was the reason!