WAV file export

[2L40K]

I know it's absolutely free, but MP3 at 48 kbps is too low of a quality.
They introduced WAV export but I can not find any way to enable it.

This one:
help.play.ht/en/article/product-update-21st-april-2021-1yitafd/

Even if the API key used is from an account where WAV export is enabled according to their video.

Or maybe the instance
"platform": "landing_demo"
does not support WAV?

[BleachDev]

I tried to find a parameter or something in the request that changes the filetype/quality but nothing changed when i switched to wav on the website, maybe it only does something when you try to download a finished script?