When calling the API to email an invoice, it seems it does not actually send it.  Below is a screen shot where I used an API call for the bottom record, and it updated its' status to "Due Today", but no email was actually sent.
The top record, I hit the "Send Email" button on the invoice, and it sent the email and updated the status.

How do you get the API to actually send an email?



Not sure what info i should and sholdnt post, so I am leaving out some values for security.
The api call i am making
https://www.zohoapis.com/books/v3/invoices/XXXXXXX/email?organization_id=XXXXXXXX


The response is a success, and I am leaving off all the bits specifying our email, etc.