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POST request returning empty body but works in postman

Hi all,
We are facing some problems with the API connector plugin when sending a POST request and hoping that someone might be able to help us/point us in the right direction.
When initialising the call, an empty body is returned (no error is thrown though), but with the same setup we get a response in postman.
Here is the cURL from postman:
curl --location --request POST ‘
–header ‘x-api-key: xxxx’
–header ‘Content-Type: application/json’
–data-raw ‘{
“from”: “45.760554, 4.861952”,
“to”: “48.844945, 2.375551”,
“dateDeparture”: “2023-08-01T10:00:00.000Z”,
“comfortClass”: 1,
“operators”: “all”,
“passengers”: [{
“birthday”: “1996-04-01”
and here are two attempts for transfering it to the API connector:

both of which are simply returning an empty body when initialising the call. Any pointers for what we might be doing wrong? Many thanks for your help!