fixes after merge

auth/services/oauth/relying_party.go

@@ -153,21 +153,23 @@ func (s *relyingParty) RequestRFC021AccessToken(ctx context.Context, requester d
 	// if there's a match, create a VP and call the token endpoint
 	// If the token endpoint succeeds, return the access token
 	// If no presentation definition matches, return a 412 "no matching credentials" error
-	submission, credentials, err := presentationDefinition.Match(walletCredentials)
+	builder := presentationDefinition.PresentationSubmissionBuilder()
+	builder.AddWallet(requester, walletCredentials)
+	format, err := determineFormat(metadata.VPFormats)
+	if err != nil {
+		return nil, err
+	}
+	submission, signInstructions, err := builder.Build(format)
 	if err != nil {
 		return nil, fmt.Errorf("failed to match presentation definition: %w", err)
 	}
-	if len(credentials) == 0 {
+	if signInstructions.Empty() {
 		return nil, core.Error(http.StatusPreconditionFailed, "no matching credentials")
 	}
 	expires := time.Now().Add(time.Minute * 15) //todo
 	nonce := nutsCrypto.GenerateNonce()
-	// determine the format to use
-	format, err := determineFormat(metadata.VPFormats)
-	if err != nil {
-		return nil, err
-	}
-	vp, err := s.wallet.BuildPresentation(ctx, credentials, holder.PresentationOptions{
+	// todo: support multiple wallets
+	vp, err := s.wallet.BuildPresentation(ctx, signInstructions[0].VerifiableCredentials, holder.PresentationOptions{
 		Format: format,
 		ProofOptions: proof.ProofOptions{
 			Created:   time.Now(),

vcr/pe/presentation_submission.go

@@ -75,9 +75,27 @@ type SignInstruction struct {
 	inputDescriptorMappingObjects []InputDescriptorMappingObject
 }
 
+// Empty returns true if there are no VCs in the SignInstruction.
+func (signInstruction SignInstruction) Empty() bool {
+	return len(signInstruction.VerifiableCredentials) == 0
+}
+
+// SignInstructions is a list of SignInstruction.
+type SignInstructions []SignInstruction
+
+// Empty returns true if all SignInstructions are empty.
+func (signInstructions SignInstructions) Empty() bool {
+	for _, signInstruction := range []SignInstruction(signInstructions) {
+		if !signInstruction.Empty() {
+			return false
+		}
+	}
+	return true
+}
+
 // Build creates a PresentationSubmission from the added wallets.
 // The VP format is determined by the given format.
-func (b *PresentationSubmissionBuilder) Build(format string) (PresentationSubmission, []SignInstruction, error) {
+func (b *PresentationSubmissionBuilder) Build(format string) (PresentationSubmission, SignInstructions, error) {
 	presentationSubmission := PresentationSubmission{
 		Id:           uuid.New().String(),
 		DefinitionId: b.presentationDefinition.Id,