[has-PR] requesting multiple credential_types in initiate-issuance request

[Kristina Yasuda]

authorization request in OpenID4VCI already allows for it.

Per comment in openid / connect / Pull Request #226: change to openid://initiate-issuance: — Bitbucket

[Kristina Yasuda]

PR #269

[Kristina Yasuda]

I did not realize the current guidance was to use multiple “credential_type“ parameters. I think “`credential_type`: REQUIRED. Space delimited, case sensitive list of ASCII string values“ is more consistent with the rest of the OAuth design, but open to discussion.

The Wallet MUST be able to process multiple occurences of the URL query parameters `credential_type`. Multiple occurences MUST be treated as multiple values of the respective parameter.

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