Hi,
- You can refer for on this thread for the duplicate invoices response. Duplicate Invoices
- As far as I know, there is no Official API for this, @Ankit.K.Tiwari , please confirm
- For timeouts, It is ok to resubmit it since it didn’t reach the ZATCA server, and apply the validations for handling Duplicates or already exist Invoices.
I hope this answer atleast gave you some clarification.