Dear ASP's:
Greetings from TaxPro GSP Team..!!
Eivital API's (v1.04) :-
Other Important Note From TaxPro GSP:
1. Start using https://einvapi.charteredinfo.com for EWB, eInvoice, and ASP Api at the earliest opportunity.
2. Please make sure you are passing Header "Content-Type" : "application/json" in ALL post requests.
3. Old sandbox at http(s)://testapi.taxprogsp.co.in is deprecated and will not be updated in future. We would try to provide above eInvoice Version 1.04 update on old sandbox also.
For more details refer below link