Participant vs ParticipantAgent

[matthiasdg]

Hi, I noticed when I experimented with the iam oauth2-service that before I configured things correctly, I got upon a contract negotiation:
Contract agreement received. Validation failed: Invalid provider credentials.
Now I noticed this was due to

Connector/core/control-plane/contract-core/src/main/java/org/eclipse/edc/connector/contract/validation/ContractValidationServiceImpl.java

Line 108 in b6e26c1

if (!Objects.equals(agent.getIdentity(), agreement.getProviderId())) {

;
where agent.getIdentity() and agreement.getProviderId() must be equal. After looking into this, it seems agent.getIdentity was the client_id in my oauth2 client, while agreement.getProviderId is edc.participant.id (through ContractCoreExtension). Seeing the explanation in ParticipantAgent.java I was a bit confused; does edc.participant.id also refer to a participant agent or to a participant?
(It's just a question out of interest; in my case I just made sure my oauth2 client matches my participant.id and I have no use case for multiple agents for 1 participant)