curl -X POST -u "apikey:GR1bb3zVMs9fcNKL6pA9-5zj9ptWliCu6eh9oupUnpZB" ^
--header "Content-Type: application/json" ^
--header "Accept: audio/wav" ^
--data "{\"text\":\"hello world\"}" ^
--output hello_world.wav ^
"https://api.eu-gb.text-to-speech.watson.cloud.ibm.com/instances/9886a3ce-5734-455f-8f78-7a56381da686/v1/synthesize"