That's a crazy number.  You need to be patient.  That many entries could take over an hour to import.

That's a bit much. The API isn't an import tool. It's an integration interface. The web API probably timed out before the job finished. How big was the JSON doc you sent Serialise it and try it through the swagger UI and see what happens. I wouldn't be looking to send more than 50 invoices at any one time.

Hi Jay,

It took around 18 mins to create all 19K entries in a batch but the API still not returning any response until the API timeout after an hour.