Poland e-Invoicing

With reference to E-Business Suite: Global Electronic Invoicing (Doc ID 2880033.1)

"A key element of the PEPPOL Network is the use of approved service providers (PEPPOL Access Point) to manage the exchange of documents within the network (a 4-corner model). The PEPPOL Service Provider can be a PEPPOL certified third-party service provider, or in some cases country government agencies have taken on this role themselves."

Does anyone have any recommendation for approved service providers?

Thanks

Lag