# Metadata (DCP) {% hint style="info" %} Specifications and best practice implementations for Verifiable Credentials are currently being developed. This page is expected to be updated, closely following these developments. {% endhint %} The `GET` request to the `/metadata` endpoint requests an overview of supported credential types by the issuer. The credential types that are defined by the iSHARE Framework are defined on the [iSHARE Schemas Site](https://schemas.ishare.eu/v3/). An iSHARE Participant Registry must, at a minimum, issue a [Participant Credential](https://schemas.ishare.eu/v3/party/schema.json). An iSHARE Authorisation Registry must, at a minimum, issue a [Data Rights Credential](https://schemas.ishare.eu/v3/party/schema.json). {% hint style="info" %} The `GET` request to the `/metadata` is an **OPTIONAL** endpoint and is part of the iSHARE Framework's Verifiable Credentials support in line with the **Decentralised Claims Protocol (DCP)**. {% endhint %} ## Gets credential types supported by the issuer > Retrieves a list of supported credential types that the issuer can provide. More information in the \[DCP specification]\( > The credential types that are defined by the iSHARE Framework are defined on the \[iSHARE Schemas Site]\( > An iSHARE Participant Registry must at minimum issue a \[Participant Credential]\(). An iSHARE Authorization Registry must at minimum issue a \[Data Rights Credential]\(). ```json {"openapi":"3.1.0","info":{"title":"iSHARE Decentralized Claims Protocol (DCP) API specifications","version":"3.0"},"tags":[{"name":"Issuer","description":"Endpoints relevant for the VC Issuer role (e.g., issuing credentials, issuer metadata)."}],"security":[{"BearerAuth":[]}],"components":{"securitySchemes":{"BearerAuth":{"type":"http","scheme":"bearer","bearerFormat":"JWT","description":"iSHARE JWT Bearer token authentication"}}},"paths":{"/metadata":{"get":{"tags":["Issuer"],"summary":"Gets credential types supported by the issuer","description":"Retrieves a list of supported credential types that the issuer can provide. More information in the [DCP specification](https://eclipse-dataspace-dcp.github.io/decentralized-claims-protocol/v1.0/#issuermetadata).\nThe credential types that are defined by the iSHARE Framework are defined on the [iSHARE Schemas Site](https://schemas.ishare.eu/v3/).\nAn iSHARE Participant Registry must at minimum issue a [Participant Credential](https://schemas.ishare.eu/v3/party/schema.json). An iSHARE Authorization Registry must at minimum issue a [Data Rights Credential](https://schemas.ishare.eu/v3/data-rights/schema.json).","operationId":"get-metadata","responses":{"200":{"description":"Metadata retrieved successfully","content":{"application/json":{"schema":{"$ref":"#/x-ext/59ce031"}}}},"401":{"description":"Unauthorized - Invalid or missing authentication"},"404":{"description":"Metadata not found"},"500":{"description":"Internal Server Error"}}}}}} ``` ### Request model There are no request parameters defined. ### Example request ```json GET /metadata Authorization: Bearer YOUR_SECRET_TOKEN ``` ### Response model The model for the IssuerMetadata is defined in: . * `@context`\ **Array of Strings**. Root level. (Required)\ Specifies a valid Json-Ld context. Must contain `"https://w3id.org/dspace-dcp/v1.0/dcp.jsonld"` * `type`\ **String**. Root level. (Required)\ A string specifying the CredentialStatus type. Must contain `"IssuerMetadata"` * `issuer` **String**. Root level. (Required)\ The credential issuer DID. * `credentialsSupported`\ **Array of Objects**. Root level.\ An array of [credential objects](https://eclipse-dataspace-dcp.github.io/decentralized-claims-protocol/v1.0/#credentialobject) that the issuer supports. * `id`\ **String**. Contained in credential object. (Required)\ A string defining a unique, stable identifier for this CredentialObject. * `type`\ **String**. Contained in credential object. (Required)\ A string specifying the object type. Must contain `CredentialObject`. * `credentialType`\ **String**. Contained in credential object.\ A single string specifying type of credential being offered. * `credentialSchema`\ **String**. Contained in credential object.\ A URL pointing to the credential schema of the object in a VC's `credentialSubject` property. * `bindingMethods`\ **Array of strings**. Contained in credential object.\ An array of strings defining the key material that an issued credential is bound to. * `profile`\ **String**. Contained in credential object.\ Contains the alias of the [profiles](https://eclipse-dataspace-dcp.github.io/decentralized-claims-protocol/v1.0/#profiles-of-the-decentralized-claims-protocol), e.g. `"vc20-bssl/jwt"`. * `issuancePolicy`\ **Object**. Contained in credential object.\ A [presentation definition](https://identity.foundation/presentation-exchange/spec/v2.1.1/#presentation-definition) signifying the required [Verifiable Presentation](https://eclipse-dataspace-dcp.github.io/decentralized-claims-protocol/v1.0/#dfn-verifiable-presentation) for issuance. Further details are omitted from this specifications, refer to for more information. ### Example response ```json { "@context": [ "https://w3id.org/dspace-dcp/v1.0/dcp.jsonld" ], "type": "IssuerMetadata", "issuer": "did:ishare:EU.NL.NTRLNL-10000000", "credentialsSupported": [ { "id": "d5c77b0e-7f4e-4fd5-8c5f-28b5fc3f96d1", "type": "CredentialObject", "credentialType": "FrameworkRole", "credentialSchema": "https://schemas.ishare.eu/v3/party/claims/framework-role/schema.json", "bindingMethods": [ "did:web" ], "profile": "vc10-sl2021/jwt", "issuancePolicy": { "id": "a468fc48-5c1a-43c7-903e-ab1851882afb", "input_descriptors": [ { "id": "framework-compliance", "name": "Requires proof of compliance to framework", "purpose" :: "constraints": { "fields": [ { "path": [ "$.vc.type" ], "filter": { "type": "string", "pattern": "^FrameworkCompliance$" } } ] } } ] } } ] } ```