Problems with the send_email method

Hi there,

I’m pretty sure I’m doing everything right.
I can make requests to do everything else, but the send_email method, when supplied with appropriate parameters is just giving me a blank error or a nil response depending on which HTTP client I use.

I’m sending in the form

I’m posting with

path = ""
body ="{\"invoice\":{\"email\":{\"to\":\"\",\"from\":\"\",\"subject\":\"<comapny_name> - Invoice\",\"body\":\"Test Invoice Message\",\"email_to_sender\":true}}}"

Anyone here available to help?
Can’t see what’s wrong with what I’m sending through… And I’m getting nothing helpful back as an error message