Existing POS will need to be upgraded in order to complete their interfacing process.
The upgrade of active POS is carried out remotely under the responsibility of Payment Network Service Providers (NSPs). Businesses are informed of the upgrade’s completion through the payment services register application.
Payment Network Service Providers (NSPs) are obliged to inform IAPR at the latest on a daily basis about the Payment Instruments they manage, in which the upgrade was completed the day before.
IAPR informs the Users of payment services about the possibility of upgrading each Payment Instrument they have. The update is done by sending an e-mail message and posting a relevant notification in their inbox (My Messages) in the "myAADE" digital portal, as well as by indicating "To Be Upgraded" in the Payment Services Register.
Contact

Via the Taxpayers’ Customer Service (ΚΕΦ) at the phone:
213 1621000

Sending a query from your personal myAADE account (using TAXISnet credentials) here, by selecting the category "Μητρώο – Διασύνδεση Μέσων Πληρωμών (EFT/POS)"

For Payment Service Providers (Acquirers) and Network Service Providers (NSPs) solely, email queries are accepted at posregistry.support@aade.gr, including your full name, Tax Identification Number(ΤΙΝ), landline and/or mobile phone number.
For technical issues, please include screenshots of the problem you are facing by using the "File Attachment" feature in your email (only free text in the body of the message is accepted).