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Your question doesn’t tell us anything that would enable us to help or guide you.
I would recommend reading the guidance that is shown when you first click on “new topic”.
Things like…
- What have you tried so far?
- What is the actual error message?
- Do you have an example request?
I would highly recommend reading the guidelines before Posting questions.
The documentation for the API is here.
Speakatoo - API Documentation - Text to Speech (MP3 & WAV) in Natural Male/Female Voices
Can’t see why cookies would have any bearing on any of those API calls.