So there is no mention of how to achieve this in the API documentation.
Looking around this group it seems by posting an empty hash should
accomplish this.
However if I post:
{"invoice":{"email":{}}}
I receive the error Required parameter missing: email
I’ve tried a different combination of email parameters with varying errors.
The only way I’ve been able to actually send an email is by supplying to,
from, subject and body.
Am I missing something here?