feat: added token_endpoint to the metadata

Author: sksadjad

packages/issuer-rest/lib/oid4vci-api-functions.ts

@@ -2,6 +2,7 @@ import {
   ACCESS_TOKEN_ISSUER_REQUIRED_ERROR,
   adjustUrl,
   AuthorizationRequest,
+  CredentialIssuerMetadataOpts,
   CredentialOfferRESTRequest,
   CredentialRequestV1_0_11,
   determineGrantTypes,
@@ -379,9 +380,16 @@ export function pushedAuthorizationEndpoint<DIDDoc extends object>(
   })
 }
 
+function addTokenEndpoint(issuerMetadata: CredentialIssuerMetadataOpts) {
+  if (!issuerMetadata.token_endpoint) {
+    issuerMetadata.token_endpoint = `${issuerMetadata.credential_issuer}/token`
+  }
+}
+
 export function getMetadataEndpoint<DIDDoc extends object>(router: Router, issuer: VcIssuer<DIDDoc>) {
   const path = `/.well-known/openid-credential-issuer`
   router.get(path, (request: Request, response: Response) => {
+    addTokenEndpoint(issuer.issuerMetadata)
     return response.send(issuer.issuerMetadata)
   })
 }