"Invalid config" while setting up Kik bot through curl POST request

Question

I'm sure that I'm just missing something silly here, but can someone help spot my misuse of curl for setting up Kik here?

curl -H "Content-Type: application/json" -d '{"webhook": "http://example.com/kik", "features": {"manuallySendReadReceipts": False, "receiveReadReceipts": False, "receiveDeliveryReceipts": False, "receiveIsTyping": False}}' -u 'username:apikey' 'https://api.kik.com/v1/config'

I'm getting this response:

{"message":"Invalid config","error":"BadRequest"}

Answer 1

true/false in JSON are lowercase