OpenID4VP
OpenID4VP, OpenID for Verifiable Presentations, is the protocol a wallet uses to present one or more credentials to a verifier in response to a request, so the verifier can check them without a separate integration per issuer.
A relying party sends a presentation request describing what it needs to see, the wallet asks the holder to approve which credentials and claims to share, and the verifier checks the response against the original issuer signatures. OpenID4VP is the presentation protocol the EUDI Wallet uses under eIDAS 2.0, so any relying party that supports it can accept credentials from wallets issued anywhere in the EU.