@YounesGa To have each thread use only 1 line, set the value "max success usage: 1", "max number of simultaneous use: 1".
This is equivalent to the fact that after the flow finishes running with a result of Success, the already used proxy line will not be used again, whereas if there is an error, it will be reused 999999999 times and only one line. for each stream
290a12f6-98cf-4378-9d4c-72a246339adb-image.png
IBM text to speech API
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Hello
I try to use text to speech api from ibm. But I have every time a error.I have try with python and that work, but not with BAS.
The documentation :

https://cloud.ibm.com/apidocs/text-to-speech#synthesizeBAS :

I have try many thing in BAS, but I don't know how to fill the form.Someone know how to do?
Thanks
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@musterman In your screenshot, you are trying to send data not as json (although you specify the data type as json)