Disable creating invoice while subscribing.

Disable creating invoice while subscribing.

Hi,
I am creating subscription using zoho subscription API and I don't want zoho to create invoice for that subscription. Each month I am creating  invoices for each subscription according to my requirement using zoho invoice API. So how to stop creating invoice for each subscription at first time. 

I don't need zoho automated invoice creation and I am handling interaction to zoho through zoho API only, If it creates invoice, Again i need to delete it.
Any suggestion will be appreciated.

Thanks.