Want_composite OPTIONAL parameter defined in OAuth 2.0 Token Exchange that when the value of this parameter is "true", it indicates the client's desire for a composite security token to be issued, which contains claims about both the main subject of the token as well as about the party who is authorized to act on behalf of that subject.

Note that this parameter only provides a means for the OAuth Client to indicate its preference and the Authorization Server is not required to honor the stated preference and the nature of the tokens it issues are ultimately at its discretion.

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