An identifier that further defines the document and corresponds to the transaction stored in the host system. The Transaction ID is required to uniquely identify generated invoice.

The date that drives the timing of when the VAT liability arises. In
some countries, if the Tax Point Date (also called the Time of
Supply) is different from the invoice date, this field is shown
separately on an invoice. Use this field if you have reporting
compliance in Spain, Poland, and/or Hungary.

The date on which the purchaser paid for the product.

Transaction ID of the original transaction. It is used for credit note generation. It should
be a value of the previously created transaction for which a refund is created.