diff --git a/protocol/go/authorization/v2/authorization.pb.go b/protocol/go/authorization/v2/authorization.pb.go
index cecabe0934..7cc05f4f33 100644
--- a/protocol/go/authorization/v2/authorization.pb.go
+++ b/protocol/go/authorization/v2/authorization.pb.go
@@ -988,174 +988,184 @@ var file_authorization_v2_authorization_proto_rawDesc = []byte{
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+	0x02, 0x1c, 0x41, 0x75, 0x74, 0x68, 0x6f, 0x72, 0x69, 0x7a, 0x61, 0x74, 0x69, 0x6f, 0x6e, 0x5c,
+	0x56, 0x32, 0x5c, 0x47, 0x50, 0x42, 0x4d, 0x65, 0x74, 0x61, 0x64, 0x61, 0x74, 0x61, 0xea, 0x02,
+	0x11, 0x41, 0x75, 0x74, 0x68, 0x6f, 0x72, 0x69, 0x7a, 0x61, 0x74, 0x69, 0x6f, 0x6e, 0x3a, 0x3a,
+	0x56, 0x32, 0x62, 0x06, 0x70, 0x72, 0x6f, 0x74, 0x6f, 0x33,
 }
 
 var (
diff --git a/service/authorization/v2/authorization.proto b/service/authorization/v2/authorization.proto
index 4eba195ad5..73453341ed 100644
--- a/service/authorization/v2/authorization.proto
+++ b/service/authorization/v2/authorization.proto
@@ -30,12 +30,10 @@ message EntityIdentifier {
 
     // fully qualified name of the registered resource value stored in platform policy, where in
     // this case the resource acts as and represents a single entity for authorization/entitlement decisioning
-    string registered_resource_value_fqn = 2 [
-      (buf.validate.field).string = {
-        min_len: 1
-        uri: true
-      }
-    ];
+    string registered_resource_value_fqn = 2 [(buf.validate.field).string = {
+      min_len: 1
+      uri: true
+    }];
 
     // access token (JWT), which is used to create an entity chain (comprising one or more entities)
     entity.Token token = 3 [(buf.validate.field).cel = {
@@ -67,8 +65,15 @@ message Resource {
   }
 
   oneof resource {
-    AttributeValues attribute_values = 2;
-    string registered_resource_value_fqn = 3;
+    AttributeValues attribute_values = 2 [(buf.validate.field).cel = {
+      id: "attribute_values_required"
+      message: "if provided, resource.attribute_values must not be empty"
+      expression: "this.fqns.size() > 0 && this.fqns.all(item, item.isUri())"
+    }];
+    string registered_resource_value_fqn = 3 [(buf.validate.field).string = {
+      min_len: 1
+      uri: true
+    }];
   }
 }
 
diff --git a/service/authorization/v2/authorization_test.go b/service/authorization/v2/authorization_test.go
index 46cfaa3c17..110638c5a6 100644
--- a/service/authorization/v2/authorization_test.go
+++ b/service/authorization/v2/authorization_test.go
@@ -4,12 +4,933 @@ import (
 	"errors"
 	"testing"
 
+	"buf.build/go/protovalidate"
 	authzV2 "github.com/opentdf/platform/protocol/go/authorization/v2"
+	"github.com/opentdf/platform/protocol/go/entity"
+	"github.com/opentdf/platform/protocol/go/policy"
 	access "github.com/opentdf/platform/service/internal/access/v2"
 	"github.com/stretchr/testify/assert"
 	"github.com/stretchr/testify/require"
 )
 
+var (
+	sampleActionCreate = &policy.Action{
+		Name: "create",
+	}
+	sampleResourceFQN           = "https://example.com/attr/hier/value/highest"
+	sampleResourceFQN2          = "https://example.com/attr/hier/value/lowest"
+	sampleRegisteredResourceFQN = "https://example.com/reg_res/system/value/internal"
+)
+
+func getValidator() protovalidate.Validator {
+	v, err := protovalidate.New()
+	if err != nil {
+		panic(err)
+	}
+	return v
+}
+
+func Test_GetDecisionRequest_Succeeds(t *testing.T) {
+	v := getValidator()
+
+	cases := []struct {
+		name    string
+		request *authzV2.GetDecisionRequest
+	}{
+		{
+			name: "entity: token, action: create, resource: attribute values",
+			request: &authzV2.GetDecisionRequest{
+				EntityIdentifier: &authzV2.EntityIdentifier{
+					Identifier: &authzV2.EntityIdentifier_Token{
+						Token: &entity.Token{
+							EphemeralId: "123",
+							Jwt:         "sample-jwt-token",
+						},
+					},
+				},
+				Action: sampleActionCreate,
+				Resource: &authzV2.Resource{
+					Resource: &authzV2.Resource_AttributeValues_{
+						AttributeValues: &authzV2.Resource_AttributeValues{
+							Fqns: []string{sampleResourceFQN},
+						},
+					},
+				},
+			},
+		},
+		{
+			name: "entity: token, action: create, resource: registered",
+			request: &authzV2.GetDecisionRequest{
+				EntityIdentifier: &authzV2.EntityIdentifier{
+					Identifier: &authzV2.EntityIdentifier_Token{
+						Token: &entity.Token{
+							EphemeralId: "123",
+							Jwt:         "sample-jwt-token",
+						},
+					},
+				},
+				Action: sampleActionCreate,
+				Resource: &authzV2.Resource{
+					Resource: &authzV2.Resource_RegisteredResourceValueFqn{
+						RegisteredResourceValueFqn: sampleRegisteredResourceFQN,
+					},
+				},
+			},
+		},
+		{
+			name: "entity: chain, action: create, resource: attribute values",
+			request: &authzV2.GetDecisionRequest{
+				EntityIdentifier: &authzV2.EntityIdentifier{
+					Identifier: &authzV2.EntityIdentifier_EntityChain{
+						EntityChain: &entity.EntityChain{
+							EphemeralId: "1234",
+							Entities: []*entity.Entity{
+								{
+									EphemeralId: "chained-1",
+									EntityType:  &entity.Entity_EmailAddress{EmailAddress: "test@test.com"},
+									Category:    entity.Entity_CATEGORY_SUBJECT,
+								},
+								{
+									EphemeralId: "chained-2",
+									EntityType: &entity.Entity_ClientId{
+										ClientId: "client-123",
+									},
+									Category: entity.Entity_CATEGORY_ENVIRONMENT,
+								},
+							},
+						},
+					},
+				},
+				Action: sampleActionCreate,
+				Resource: &authzV2.Resource{
+					Resource: &authzV2.Resource_AttributeValues_{
+						AttributeValues: &authzV2.Resource_AttributeValues{
+							Fqns: []string{sampleResourceFQN, sampleResourceFQN2},
+						},
+					},
+				},
+			},
+		},
+		{
+			name: "entity: chain, action: create, resource: registered",
+			request: &authzV2.GetDecisionRequest{
+				EntityIdentifier: &authzV2.EntityIdentifier{
+					Identifier: &authzV2.EntityIdentifier_EntityChain{
+						EntityChain: &entity.EntityChain{
+							EphemeralId: "1234",
+							Entities: []*entity.Entity{
+								{
+									EphemeralId: "chained-1",
+									EntityType: &entity.Entity_ClientId{
+										ClientId: "client-123",
+									},
+									Category: entity.Entity_CATEGORY_ENVIRONMENT,
+								},
+							},
+						},
+					},
+				},
+				Action: sampleActionCreate,
+				Resource: &authzV2.Resource{
+					Resource: &authzV2.Resource_RegisteredResourceValueFqn{
+						RegisteredResourceValueFqn: sampleRegisteredResourceFQN,
+					},
+				},
+			},
+		},
+		{
+			name: "entity: registered resource, action: create, resource: attribute values",
+			request: &authzV2.GetDecisionRequest{
+				EntityIdentifier: &authzV2.EntityIdentifier{
+					Identifier: &authzV2.EntityIdentifier_RegisteredResourceValueFqn{
+						RegisteredResourceValueFqn: sampleRegisteredResourceFQN,
+					},
+				},
+				Action: sampleActionCreate,
+				Resource: &authzV2.Resource{
+					Resource: &authzV2.Resource_AttributeValues_{
+						AttributeValues: &authzV2.Resource_AttributeValues{
+							Fqns: []string{sampleResourceFQN2},
+						},
+					},
+				},
+			},
+		},
+		{
+			name: "entity: registered resource, action: create, resource: registered",
+			request: &authzV2.GetDecisionRequest{
+				EntityIdentifier: &authzV2.EntityIdentifier{
+					Identifier: &authzV2.EntityIdentifier_RegisteredResourceValueFqn{
+						RegisteredResourceValueFqn: sampleRegisteredResourceFQN,
+					},
+				},
+				Action: sampleActionCreate,
+				Resource: &authzV2.Resource{
+					Resource: &authzV2.Resource_RegisteredResourceValueFqn{
+						RegisteredResourceValueFqn: sampleRegisteredResourceFQN,
+					},
+				},
+			},
+		},
+	}
+
+	for _, tc := range cases {
+		t.Run(tc.name, func(t *testing.T) {
+			err := v.Validate(tc.request)
+			require.NoError(t, err, "validation should succeed for request: %s", tc.name)
+		})
+	}
+}
+
+func Test_GetDecisionRequest_Fails(t *testing.T) {
+	v := getValidator()
+	cases := []struct {
+		name                    string
+		request                 *authzV2.GetDecisionRequest
+		expectedValidationError string
+	}{
+		{
+			name: "missing entity identifier",
+			request: &authzV2.GetDecisionRequest{
+				Action: sampleActionCreate,
+				Resource: &authzV2.Resource{
+					Resource: &authzV2.Resource_AttributeValues_{
+						AttributeValues: &authzV2.Resource_AttributeValues{
+							Fqns: []string{sampleResourceFQN},
+						},
+					},
+				},
+			},
+			expectedValidationError: "entity_identifier",
+		},
+		{
+			name: "missing action",
+			request: &authzV2.GetDecisionRequest{
+				EntityIdentifier: &authzV2.EntityIdentifier{
+					Identifier: &authzV2.EntityIdentifier_Token{
+						Token: &entity.Token{
+							EphemeralId: "123",
+							Jwt:         "sample-jwt-token",
+						},
+					},
+				},
+				Resource: &authzV2.Resource{
+					Resource: &authzV2.Resource_AttributeValues_{
+						AttributeValues: &authzV2.Resource_AttributeValues{
+							Fqns: []string{sampleResourceFQN},
+						},
+					},
+				},
+			},
+			expectedValidationError: "action",
+		},
+		{
+			name: "missing resource",
+			request: &authzV2.GetDecisionRequest{
+				EntityIdentifier: &authzV2.EntityIdentifier{
+					Identifier: &authzV2.EntityIdentifier_Token{
+						Token: &entity.Token{
+							EphemeralId: "123",
+							Jwt:         "sample-jwt-token",
+						},
+					},
+				},
+				Action: sampleActionCreate,
+			},
+			expectedValidationError: "resource",
+		},
+		{
+			name: "action missing name",
+			request: &authzV2.GetDecisionRequest{
+				EntityIdentifier: &authzV2.EntityIdentifier{
+					Identifier: &authzV2.EntityIdentifier_Token{
+						Token: &entity.Token{
+							EphemeralId: "123",
+							Jwt:         "sample-jwt-token",
+						},
+					},
+				},
+				Action: &policy.Action{},
+				Resource: &authzV2.Resource{
+					Resource: &authzV2.Resource_AttributeValues_{
+						AttributeValues: &authzV2.Resource_AttributeValues{
+							Fqns: []string{sampleResourceFQN},
+						},
+					},
+				},
+			},
+			expectedValidationError: "name",
+		},
+		{
+			name: "registered resource FQN is empty",
+			request: &authzV2.GetDecisionRequest{
+				EntityIdentifier: &authzV2.EntityIdentifier{
+					Identifier: &authzV2.EntityIdentifier_Token{
+						Token: &entity.Token{
+							EphemeralId: "123",
+							Jwt:         "sample-jwt-token",
+						},
+					},
+				},
+				Action: sampleActionCreate,
+				Resource: &authzV2.Resource{
+					Resource: &authzV2.Resource_RegisteredResourceValueFqn{},
+				},
+			},
+			expectedValidationError: "resource",
+		},
+		{
+			name: "registered resource FQN is invalid",
+			request: &authzV2.GetDecisionRequest{
+				EntityIdentifier: &authzV2.EntityIdentifier{
+					Identifier: &authzV2.EntityIdentifier_Token{
+						Token: &entity.Token{
+							EphemeralId: "123",
+							Jwt:         "sample-jwt-token",
+						},
+					},
+				},
+				Action: sampleActionCreate,
+				Resource: &authzV2.Resource{
+					Resource: &authzV2.Resource_RegisteredResourceValueFqn{
+						RegisteredResourceValueFqn: "invalid format",
+					},
+				},
+			},
+			expectedValidationError: "resource",
+		},
+		{
+			name: "resource attribute value FQNs are empty",
+			request: &authzV2.GetDecisionRequest{
+				EntityIdentifier: &authzV2.EntityIdentifier{
+					Identifier: &authzV2.EntityIdentifier_Token{
+						Token: &entity.Token{
+							EphemeralId: "123",
+							Jwt:         "sample-jwt-token",
+						},
+					},
+				},
+				Action: sampleActionCreate,
+				Resource: &authzV2.Resource{
+					Resource: &authzV2.Resource_AttributeValues_{
+						AttributeValues: &authzV2.Resource_AttributeValues{
+							Fqns: []string{},
+						},
+					},
+				},
+			},
+			expectedValidationError: "resource",
+		},
+		{
+			name: "resource attribute value FQNs are invalid",
+			request: &authzV2.GetDecisionRequest{
+				EntityIdentifier: &authzV2.EntityIdentifier{
+					Identifier: &authzV2.EntityIdentifier_Token{
+						Token: &entity.Token{
+							EphemeralId: "123",
+							Jwt:         "sample-jwt-token",
+						},
+					},
+				},
+				Action: sampleActionCreate,
+				Resource: &authzV2.Resource{
+					Resource: &authzV2.Resource_AttributeValues_{
+						AttributeValues: &authzV2.Resource_AttributeValues{
+							Fqns: []string{"invalid-format"},
+						},
+					},
+				},
+			},
+			expectedValidationError: "resource",
+		},
+		{
+			name: "token entity with empty JWT",
+			request: &authzV2.GetDecisionRequest{
+				EntityIdentifier: &authzV2.EntityIdentifier{
+					Identifier: &authzV2.EntityIdentifier_Token{
+						Token: &entity.Token{
+							EphemeralId: "123",
+						},
+					},
+				},
+				Action: sampleActionCreate,
+				Resource: &authzV2.Resource{
+					Resource: &authzV2.Resource_AttributeValues_{
+						AttributeValues: &authzV2.Resource_AttributeValues{
+							Fqns: []string{sampleResourceFQN},
+						},
+					},
+				},
+			},
+			expectedValidationError: "jwt",
+		},
+		{
+			name: "entity chain with no entities",
+			request: &authzV2.GetDecisionRequest{
+				EntityIdentifier: &authzV2.EntityIdentifier{
+					Identifier: &authzV2.EntityIdentifier_EntityChain{
+						EntityChain: &entity.EntityChain{
+							EphemeralId: "1234",
+						},
+					},
+				},
+				Action: sampleActionCreate,
+				Resource: &authzV2.Resource{
+					Resource: &authzV2.Resource_AttributeValues_{
+						AttributeValues: &authzV2.Resource_AttributeValues{
+							Fqns: []string{sampleResourceFQN},
+						},
+					},
+				},
+			},
+			expectedValidationError: "entities",
+		},
+	}
+
+	for _, tc := range cases {
+		t.Run(tc.name, func(t *testing.T) {
+			err := v.Validate(tc.request)
+			if err == nil {
+				t.Errorf("expected validation error for request: %s, but got none", tc.name)
+			} else {
+				assert.Contains(t, err.Error(), tc.expectedValidationError, "validation error should contain expected message")
+			}
+		})
+	}
+}
+
+func Test_GetDecisionMultiResourceRequest_Succeeds(t *testing.T) {
+	v := getValidator()
+
+	cases := []struct {
+		name    string
+		request *authzV2.GetDecisionMultiResourceRequest
+	}{
+		{
+			name: "entity: token, action: create, multiple resources: attribute values",
+			request: &authzV2.GetDecisionMultiResourceRequest{
+				EntityIdentifier: &authzV2.EntityIdentifier{
+					Identifier: &authzV2.EntityIdentifier_Token{
+						Token: &entity.Token{
+							EphemeralId: "123",
+							Jwt:         "sample-jwt-token",
+						},
+					},
+				},
+				Action: sampleActionCreate,
+				Resources: []*authzV2.Resource{
+					{
+						Resource: &authzV2.Resource_AttributeValues_{
+							AttributeValues: &authzV2.Resource_AttributeValues{
+								Fqns: []string{sampleResourceFQN},
+							},
+						},
+					},
+					{
+						Resource: &authzV2.Resource_AttributeValues_{
+							AttributeValues: &authzV2.Resource_AttributeValues{
+								Fqns: []string{sampleResourceFQN2},
+							},
+						},
+					},
+				},
+			},
+		},
+		{
+			name: "entity: chain, action: create, multiple resources: mixed types",
+			request: &authzV2.GetDecisionMultiResourceRequest{
+				EntityIdentifier: &authzV2.EntityIdentifier{
+					Identifier: &authzV2.EntityIdentifier_EntityChain{
+						EntityChain: &entity.EntityChain{
+							EphemeralId: "1234",
+							Entities: []*entity.Entity{
+								{
+									EphemeralId: "chained-1",
+									EntityType:  &entity.Entity_EmailAddress{EmailAddress: "test@test.com"},
+									Category:    entity.Entity_CATEGORY_SUBJECT,
+								},
+							},
+						},
+					},
+				},
+				Action: sampleActionCreate,
+				Resources: []*authzV2.Resource{
+					{
+						Resource: &authzV2.Resource_AttributeValues_{
+							AttributeValues: &authzV2.Resource_AttributeValues{
+								Fqns: []string{sampleResourceFQN},
+							},
+						},
+					},
+					{
+						Resource: &authzV2.Resource_RegisteredResourceValueFqn{
+							RegisteredResourceValueFqn: sampleRegisteredResourceFQN,
+						},
+					},
+				},
+			},
+		},
+		{
+			name: "entity: registered resource, action: create, multiple resources: registered",
+			request: &authzV2.GetDecisionMultiResourceRequest{
+				EntityIdentifier: &authzV2.EntityIdentifier{
+					Identifier: &authzV2.EntityIdentifier_RegisteredResourceValueFqn{
+						RegisteredResourceValueFqn: sampleRegisteredResourceFQN,
+					},
+				},
+				Action: sampleActionCreate,
+				Resources: []*authzV2.Resource{
+					{
+						Resource: &authzV2.Resource_RegisteredResourceValueFqn{
+							RegisteredResourceValueFqn: sampleRegisteredResourceFQN,
+						},
+					},
+					{
+						Resource: &authzV2.Resource_RegisteredResourceValueFqn{
+							RegisteredResourceValueFqn: "https://example.com/another/registered/resource",
+						},
+					},
+				},
+			},
+		},
+	}
+
+	for _, tc := range cases {
+		t.Run(tc.name, func(t *testing.T) {
+			err := v.Validate(tc.request)
+			require.NoError(t, err, "validation should succeed for request: %s", tc.name)
+		})
+	}
+}
+
+func Test_GetDecisionMultiResourceRequest_Fails(t *testing.T) {
+	v := getValidator()
+
+	cases := []struct {
+		name                    string
+		request                 *authzV2.GetDecisionMultiResourceRequest
+		expectedValidationError string
+	}{
+		{
+			name: "missing entity identifier",
+			request: &authzV2.GetDecisionMultiResourceRequest{
+				Action: sampleActionCreate,
+				Resources: []*authzV2.Resource{
+					{
+						Resource: &authzV2.Resource_AttributeValues_{
+							AttributeValues: &authzV2.Resource_AttributeValues{
+								Fqns: []string{sampleResourceFQN},
+							},
+						},
+					},
+				},
+			},
+			expectedValidationError: "entity_identifier",
+		},
+		{
+			name: "missing action",
+			request: &authzV2.GetDecisionMultiResourceRequest{
+				EntityIdentifier: &authzV2.EntityIdentifier{
+					Identifier: &authzV2.EntityIdentifier_Token{
+						Token: &entity.Token{
+							EphemeralId: "123",
+							Jwt:         "sample-jwt-token",
+						},
+					},
+				},
+				Resources: []*authzV2.Resource{
+					{
+						Resource: &authzV2.Resource_AttributeValues_{
+							AttributeValues: &authzV2.Resource_AttributeValues{
+								Fqns: []string{sampleResourceFQN},
+							},
+						},
+					},
+				},
+			},
+			expectedValidationError: "action",
+		},
+		{
+			name: "action missing name",
+			request: &authzV2.GetDecisionMultiResourceRequest{
+				EntityIdentifier: &authzV2.EntityIdentifier{
+					Identifier: &authzV2.EntityIdentifier_Token{
+						Token: &entity.Token{
+							EphemeralId: "123",
+							Jwt:         "sample-jwt-token",
+						},
+					},
+				},
+				Action: &policy.Action{},
+				Resources: []*authzV2.Resource{
+					{
+						Resource: &authzV2.Resource_AttributeValues_{
+							AttributeValues: &authzV2.Resource_AttributeValues{
+								Fqns: []string{sampleResourceFQN},
+							},
+						},
+					},
+				},
+			},
+			expectedValidationError: "name",
+		},
+		{
+			name: "missing resources",
+			request: &authzV2.GetDecisionMultiResourceRequest{
+				EntityIdentifier: &authzV2.EntityIdentifier{
+					Identifier: &authzV2.EntityIdentifier_Token{
+						Token: &entity.Token{
+							EphemeralId: "123",
+							Jwt:         "sample-jwt-token",
+						},
+					},
+				},
+				Action: sampleActionCreate,
+			},
+			expectedValidationError: "resources",
+		},
+		{
+			name: "empty resources array",
+			request: &authzV2.GetDecisionMultiResourceRequest{
+				EntityIdentifier: &authzV2.EntityIdentifier{
+					Identifier: &authzV2.EntityIdentifier_Token{
+						Token: &entity.Token{
+							EphemeralId: "123",
+							Jwt:         "sample-jwt-token",
+						},
+					},
+				},
+				Action:    sampleActionCreate,
+				Resources: []*authzV2.Resource{},
+			},
+			expectedValidationError: "resources",
+		},
+		{
+			name: "invalid resource - registered resource FQN is empty",
+			request: &authzV2.GetDecisionMultiResourceRequest{
+				EntityIdentifier: &authzV2.EntityIdentifier{
+					Identifier: &authzV2.EntityIdentifier_Token{
+						Token: &entity.Token{
+							EphemeralId: "123",
+							Jwt:         "sample-jwt-token",
+						},
+					},
+				},
+				Action: sampleActionCreate,
+				Resources: []*authzV2.Resource{
+					{
+						Resource: &authzV2.Resource_RegisteredResourceValueFqn{},
+					},
+				},
+			},
+			expectedValidationError: "resource",
+		},
+		{
+			name: "invalid resource - empty attribute values",
+			request: &authzV2.GetDecisionMultiResourceRequest{
+				EntityIdentifier: &authzV2.EntityIdentifier{
+					Identifier: &authzV2.EntityIdentifier_Token{
+						Token: &entity.Token{
+							EphemeralId: "123",
+							Jwt:         "sample-jwt-token",
+						},
+					},
+				},
+				Action: sampleActionCreate,
+				Resources: []*authzV2.Resource{
+					{
+						Resource: &authzV2.Resource_AttributeValues_{
+							AttributeValues: &authzV2.Resource_AttributeValues{
+								Fqns: []string{},
+							},
+						},
+					},
+				},
+			},
+			expectedValidationError: "resource",
+		},
+		{
+			name: "invalid resource - invalid attribute values",
+			request: &authzV2.GetDecisionMultiResourceRequest{
+				EntityIdentifier: &authzV2.EntityIdentifier{
+					Identifier: &authzV2.EntityIdentifier_Token{
+						Token: &entity.Token{
+							EphemeralId: "123",
+							Jwt:         "sample-jwt-token",
+						},
+					},
+				},
+				Action: sampleActionCreate,
+				Resources: []*authzV2.Resource{
+					{
+						Resource: &authzV2.Resource_AttributeValues_{
+							AttributeValues: &authzV2.Resource_AttributeValues{
+								Fqns: []string{"invalid-format"},
+							},
+						},
+					},
+				},
+			},
+			expectedValidationError: "resource",
+		},
+		{
+			name: "token entity with empty JWT",
+			request: &authzV2.GetDecisionMultiResourceRequest{
+				EntityIdentifier: &authzV2.EntityIdentifier{
+					Identifier: &authzV2.EntityIdentifier_Token{
+						Token: &entity.Token{
+							EphemeralId: "123",
+						},
+					},
+				},
+				Action: sampleActionCreate,
+				Resources: []*authzV2.Resource{
+					{
+						Resource: &authzV2.Resource_AttributeValues_{
+							AttributeValues: &authzV2.Resource_AttributeValues{
+								Fqns: []string{sampleResourceFQN},
+							},
+						},
+					},
+				},
+			},
+			expectedValidationError: "jwt",
+		},
+		{
+			name: "entity chain with no entities",
+			request: &authzV2.GetDecisionMultiResourceRequest{
+				EntityIdentifier: &authzV2.EntityIdentifier{
+					Identifier: &authzV2.EntityIdentifier_EntityChain{
+						EntityChain: &entity.EntityChain{
+							EphemeralId: "1234",
+						},
+					},
+				},
+				Action: sampleActionCreate,
+				Resources: []*authzV2.Resource{
+					{
+						Resource: &authzV2.Resource_AttributeValues_{
+							AttributeValues: &authzV2.Resource_AttributeValues{
+								Fqns: []string{sampleResourceFQN},
+							},
+						},
+					},
+				},
+			},
+			expectedValidationError: "entities",
+		},
+		{
+			name: "registered resource as entity with invalid URI",
+			request: &authzV2.GetDecisionMultiResourceRequest{
+				EntityIdentifier: &authzV2.EntityIdentifier{
+					Identifier: &authzV2.EntityIdentifier_RegisteredResourceValueFqn{
+						RegisteredResourceValueFqn: "invalid uri",
+					},
+				},
+				Action: sampleActionCreate,
+				Resources: []*authzV2.Resource{
+					{
+						Resource: &authzV2.Resource_AttributeValues_{
+							AttributeValues: &authzV2.Resource_AttributeValues{
+								Fqns: []string{sampleResourceFQN},
+							},
+						},
+					},
+				},
+			},
+			expectedValidationError: "registered_resource_value_fqn",
+		},
+	}
+
+	for _, tc := range cases {
+		t.Run(tc.name, func(t *testing.T) {
+			err := v.Validate(tc.request)
+			if err == nil {
+				t.Errorf("expected validation error for request: %s, but got none", tc.name)
+			} else {
+				assert.Contains(t, err.Error(), tc.expectedValidationError, "validation error should contain expected message")
+			}
+		})
+	}
+}
+
+func Test_GetEntitlementsRequest_Succeeds(t *testing.T) {
+	v := getValidator()
+
+	cases := []struct {
+		name    string
+		request *authzV2.GetEntitlementsRequest
+	}{
+		{
+			name: "entity: token, with comprehensive hierarchy",
+			request: &authzV2.GetEntitlementsRequest{
+				EntityIdentifier: &authzV2.EntityIdentifier{
+					Identifier: &authzV2.EntityIdentifier_Token{
+						Token: &entity.Token{
+							EphemeralId: "123",
+							Jwt:         "sample-jwt-token",
+						},
+					},
+				},
+				WithComprehensiveHierarchy: &[]bool{true}[0],
+			},
+		},
+		{
+			name: "entity: token, without comprehensive hierarchy",
+			request: &authzV2.GetEntitlementsRequest{
+				EntityIdentifier: &authzV2.EntityIdentifier{
+					Identifier: &authzV2.EntityIdentifier_Token{
+						Token: &entity.Token{
+							EphemeralId: "123",
+							Jwt:         "sample-jwt-token",
+						},
+					},
+				},
+				WithComprehensiveHierarchy: &[]bool{false}[0],
+			},
+		},
+		{
+			name: "entity: token, hierarchy option not specified",
+			request: &authzV2.GetEntitlementsRequest{
+				EntityIdentifier: &authzV2.EntityIdentifier{
+					Identifier: &authzV2.EntityIdentifier_Token{
+						Token: &entity.Token{
+							EphemeralId: "123",
+							Jwt:         "sample-jwt-token",
+						},
+					},
+				},
+			},
+		},
+		{
+			name: "entity: chain of multiple entities",
+			request: &authzV2.GetEntitlementsRequest{
+				EntityIdentifier: &authzV2.EntityIdentifier{
+					Identifier: &authzV2.EntityIdentifier_EntityChain{
+						EntityChain: &entity.EntityChain{
+							EphemeralId: "1234",
+							Entities: []*entity.Entity{
+								{
+									EphemeralId: "chained-1",
+									EntityType:  &entity.Entity_EmailAddress{EmailAddress: "test@test.com"},
+									Category:    entity.Entity_CATEGORY_SUBJECT,
+								},
+								{
+									EphemeralId: "chained-2",
+									EntityType: &entity.Entity_ClientId{
+										ClientId: "client-123",
+									},
+									Category: entity.Entity_CATEGORY_ENVIRONMENT,
+								},
+							},
+						},
+					},
+				},
+				WithComprehensiveHierarchy: &[]bool{true}[0],
+			},
+		},
+		{
+			name: "entity: registered resource",
+			request: &authzV2.GetEntitlementsRequest{
+				EntityIdentifier: &authzV2.EntityIdentifier{
+					Identifier: &authzV2.EntityIdentifier_RegisteredResourceValueFqn{
+						RegisteredResourceValueFqn: sampleRegisteredResourceFQN,
+					},
+				},
+			},
+		},
+	}
+
+	for _, tc := range cases {
+		t.Run(tc.name, func(t *testing.T) {
+			err := v.Validate(tc.request)
+			require.NoError(t, err, "validation should succeed for request: %s", tc.name)
+		})
+	}
+}
+
+func Test_GetEntitlementsRequest_Fails(t *testing.T) {
+	v := getValidator()
+
+	cases := []struct {
+		name                    string
+		request                 *authzV2.GetEntitlementsRequest
+		expectedValidationError string
+	}{
+		{
+			name:                    "missing entity identifier",
+			request:                 &authzV2.GetEntitlementsRequest{},
+			expectedValidationError: "entity_identifier",
+		},
+		{
+			name: "token entity with empty JWT",
+			request: &authzV2.GetEntitlementsRequest{
+				EntityIdentifier: &authzV2.EntityIdentifier{
+					Identifier: &authzV2.EntityIdentifier_Token{
+						Token: &entity.Token{
+							EphemeralId: "123",
+						},
+					},
+				},
+			},
+			expectedValidationError: "jwt",
+		},
+		{
+			name: "entity chain with no entities",
+			request: &authzV2.GetEntitlementsRequest{
+				EntityIdentifier: &authzV2.EntityIdentifier{
+					Identifier: &authzV2.EntityIdentifier_EntityChain{
+						EntityChain: &entity.EntityChain{
+							EphemeralId: "1234",
+						},
+					},
+				},
+			},
+			expectedValidationError: "entities",
+		},
+		{
+			name: "registered resource FQN is empty",
+			request: &authzV2.GetEntitlementsRequest{
+				EntityIdentifier: &authzV2.EntityIdentifier{
+					Identifier: &authzV2.EntityIdentifier_RegisteredResourceValueFqn{
+						RegisteredResourceValueFqn: "",
+					},
+				},
+			},
+			expectedValidationError: "registered_resource_value_fqn",
+		},
+		{
+			name: "registered resource FQN is invalid URI",
+			request: &authzV2.GetEntitlementsRequest{
+				EntityIdentifier: &authzV2.EntityIdentifier{
+					Identifier: &authzV2.EntityIdentifier_RegisteredResourceValueFqn{
+						RegisteredResourceValueFqn: "invalid uri",
+					},
+				},
+			},
+			expectedValidationError: "registered_resource_value_fqn",
+		},
+		{
+			name: "no identifier specified",
+			request: &authzV2.GetEntitlementsRequest{
+				EntityIdentifier: &authzV2.EntityIdentifier{},
+			},
+			expectedValidationError: "identifier",
+		},
+	}
+
+	for _, tc := range cases {
+		t.Run(tc.name, func(t *testing.T) {
+			err := v.Validate(tc.request)
+			if err == nil {
+				t.Errorf("expected validation error for request: %s, but got none", tc.name)
+			} else {
+				assert.Contains(t, err.Error(), tc.expectedValidationError, "validation error should contain expected message")
+			}
+		})
+	}
+}
+
 func Test_RollupSingleResourceDecision(t *testing.T) {
 	tests := []struct {
 		name            string