How to change Peppol provider?
Short answer
Changing the Peppol provider (Access Point) is technically the same as changing the e-invoicing delivery-service provider — the same contractual and SMP/SML process. However, for the ERP and API teams, the key technical part is: inventory of participant IDs, document types and integrations before switching, testing both sending and receiving through the sandbox of the new provider, verifying routing through the public Peppol Directory after the migration code, and saving the migration log as evidence in case of a delivery dispute during the transition.
What is really going on today
List of Peppol IDs (participant identifiers), supported document types (Invoice, Credit Note...), active API integrations, webhooks and API keys to be replaced.
One clear term
Both the old and the new provider must agree on an exact date when the original provider will start deregistration and the new one will take over the migration code — an uncoordinated transition is the most common source of a short outage.
Both sending and receiving, not just logging in
Test the real sending and receiving of the document in the sandbox of the new provider — a successful login to the new portal does not say anything about whether the routing really works.
Public Peppol Directory
After the migration is complete, you can independently verify the routing of your Peppol ID in the public search engine Peppol Directory — see also how to verify if a business is in Peppol.
Conclusion
Not legal advice. Machine-translated answer, not yet manually reviewed. For the exact wording, see the Slovak original.