Greek IRS REST API

Hi,

According to Greek tax law, every invoice issued by our system, needs to be sent automatically to the Greek IRS. More info here: www.aade.gr/myDATA-IAPR-e-books and technical documentation: www.aade.gr/sites/default/files/2020-04/...on%20v0%206b_eng.pdf

This is the REST API documentation: mydata-dev.portal.azure-api.net/docs/ser...ns/post-sendinvoices?

I would like to stress the importance and urgency of this request, since without this any invoice issued by the website/component is illegal, so we cannot go live without this.
For the above reason we would appreciate if we could have an estimate on the time involved.

Thank you in advance.