South korea upgrade

Hi Team,

We are trying to implement South korea as a new OU in R12. Could you please provide us the below info:

1.How the AR invoicing is to be handled.

2.Mandatory rules to be followed for services and Product invoicing.

3.Any third party tools or govt sites for e-invoicing (its approach)

4.Any specific Mandatory Localizations

5.Print of the Transactions and language to be used.

6.Document seq # is mandatory to be sequential

7.E-Invoicing approach

8.Is it a general practice in South Korea businesses to consolidate multiple remittance invoices (generated from Oracle ERP system) into one VAT invoice? If yes,how do they do returns?