Zoho Books API - no invoice URL for recurring invoices?

Zoho Books API - no invoice URL for recurring invoices?

For normal invoices, the "Get Invoice" API returns the Invoice URL. But for recurring invoices this seems to be missing. I am trying to set up Stripe integration on my website for recurring invoices so that the customer can pay from the website rather than having to send email, etc. This seems possible for normal invoices but not for recurring invoices because of the missing URL. Is this correct? And is there any workaround?