How to send reply in Tickets as Contact?

Hi,

I've successfully created a Tickets by POST https://desk.zoho.com/api/v1/tickets and included contactId and set the channel to EMAIL in the payload. Then I get a ticketsId from successful response.

When I tried to send reply to the created Tickets as contact (customer@email.com) by POST https://desk.zoho.com/api/v1/tickets/{ticketsId}/sendReply and included all these fields :

{

"channel" : "EMAIL",

"to" : "support@my.zohodesk.com",

"fromEmailAddress" : "customer@email.com",

"contentType" : "plainText",

"content" : "We have identified the root cause and fixed it.",

"isForward" : "true"

}

I've got an error :

{

"errorCode": "UNPROCESSABLE_ENTITY",

"message": "The value passed for the 'fromEmailAddress' parameter is invalid."

}

Then I re-read the API documentation, it says :

Send Email Reply

This API sends an email reply. The from address in the email must be a from address configured in your help desk portal.

So then I changed the fromEmailAddress from customer@email.com to support@my.zohodesk.com

and then it returned a successful response.

But that was not my goal here - what I was trying to achieve is sending a reply from a contact email address (who created the tickets - as customer@email.com) to the created tickets. How do I achieve that? I've searched through the API Documentation and can't find something which capable to do that.

Regards,

Mahdi