[Openid-specs-ab] Issue #1466: Structure and location of OP metadata to support credential issuance (openid/connect)

[Tobias Looker]

New issue 1466: Structure and location of OP metadata to support credential issuance
https://bitbucket.org/openid/connect/issues/1466/structure-and-location-of-op-metadata-to

Tobias Looker:

Currently the spec makes use of credential manifest as the primary source of syntax for a provider to advertise what credentials it supports the issuance of. I propose that we opt to define our own simpler syntax that is more in keeping with how existing OpenID metadata is defined. Below is an annotated sample of my proposal

```
{
    "credentials_supported": [ // An array of objects
        {
            "name": "University Credential",
            "type": "university_degree", // Normatively defined as a string so CAN be something stricter like a URI/URL
            "formats": {
                "w3c_vc" : { // The structure of the object to be somewhat dictated by the format identifer
                  "binding_methods_supported": [ "did" ],
                  "proof_types_supported": [ "Ed25519Signature2018" ]
                }
            },
            "claims": { // Optional This abstraction could be difficult to maintain, need to validate it more
                "given_name": {
                    "display": "Given Name",
                    "description": "The given name of the subject of the degree",
                    "path": "$.values.given_name", // Potential path expression
                    "mandatory": true // Assume default is false if omitted
                },
                "last_name": {
                  "mandatory": true
                },
                "degree": {
                  "mandatory": true
                },
                "gpa": {
                  "mandatory": false
                }
            }
        }
    ],
    "credential_endpoint": "https://server.example.com/credential", // Endpoint for obtaining the issued credential
    "pop_supported": [ "did" ]
  }
```

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