Both give me blank JSON (no message whatsoever), which - in my interpretation - means that no record could be found. However, I checked in the database and there is one record with the flag. The request itself works because then I remove the filter the records get extracted.
Any idea on this issue is highly appreciated.
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Filtering contacts via API
2 months 4 days ago #69318
Thank you received: 1156
Do you have XDEBUG and an IDE set up? You could try debugging through the API code. That's the bright side of having a fully open-source system.
I'm sorry that I don't have simpler answer to your question, I don't have experience using the API...