[Openid-specs-ab] Issue #1828: OpenID4VCI: simplification of deferred issuance (openid/connect)

[Takahiko Kawasaki]

New issue 1828: OpenID4VCI: simplification of deferred issuance
https://bitbucket.org/openid/connect/issues/1828/openid4vci-simplification-of-deferred

Takahiko Kawasaki:

By returning `"error":"authorization_pending"` \(or something similar\) instead of issuing an acceptance token \(instead of returning `"acceptance_token":"..."`\), the process of deferred issuance can be simplified. The credential issuer would not have to manage acceptance tokens and would not have to implement the deferred credential endpoint.

The token endpoint in CIBA POLL/PING modes and Device Flow \(RFC 8628\) returns `"error":"authorization_pending"` until it gets ready to issue tokens.