Yes, the e-invoice will be authenticated with the digital signature of the IRP (invoice registration portal).
IRN (Invoice Reference Number) will be the hash generated by the IRP.
The registered invoice will be valid to be used by the business.
Invoices have to be uploaded on IRP one at a time.
The IRP will be able to handle a large sequence of invoices for registration and validate them. Essentially bulk upload will be required by large taxpayers who generate large number of invoices. Their ERP or accounting system will have to be designed in such a way that it makes request one by one. For the user, it will not make any difference.
The seller will need to upload the e-invoice into the Invoice Registration Portal.
The signing of e-invoice by seller is not mandatory.
Yes, that will be notified by the Government. Without registration of e-invoice the same will not be valid. Required changes will be made in the law.
Once uploaded to the invoice registration portal (IRP), it will be registered immediately, on real-time basis.