diff --git a/internal/bossraid/service_test.go b/internal/bossraid/service_test.go
index ad6bc4a..9188c18 100644
--- a/internal/bossraid/service_test.go
+++ b/internal/bossraid/service_test.go
@@ -226,8 +226,8 @@ func TestNewService_NilParams(t *testing.T) {
 
 func TestSetRewardGranter(t *testing.T) {
 	svc := NewService(nil, nil)
-	svc.SetRewardGranter(func(username string, tokenAmount uint64, assets []core.MintAssetPayload) error {
-		return nil
+	svc.SetRewardGranter(func(username string, tokenAmount uint64, assets []core.MintAssetPayload) (string, error) {
+		return "", nil
 	})
 	if svc.rewardGrant == nil {
 		t.Error("rewardGrant should be set after SetRewardGranter")
@@ -281,7 +281,7 @@ func newMockRepo() *mockRepo {
 // This lets us test business rules without external dependencies.
 type testableService struct {
 	repo        *mockRepo
-	rewardGrant func(username string, tokenAmount uint64, assets []core.MintAssetPayload) error
+	rewardGrant func(username string, tokenAmount uint64, assets []core.MintAssetPayload) (string, error)
 }
 
 func (s *testableService) requestEntry(usernames []string, bossID int) (*BossRoom, error) {
@@ -351,7 +351,7 @@ func (s *testableService) completeRaid(sessionName string, rewards []PlayerRewar
 	var results []RewardResult
 	if s.rewardGrant != nil {
 		for _, r := range rewards {
-			grantErr := s.rewardGrant(r.Username, r.TokenAmount, r.Assets)
+			_, grantErr := s.rewardGrant(r.Username, r.TokenAmount, r.Assets)
 			res := RewardResult{Username: r.Username, Success: grantErr == nil}
 			if grantErr != nil {
 				res.Error = grantErr.Error()
@@ -453,9 +453,9 @@ func TestMock_CompleteRaid_WithRewardGranter(t *testing.T) {
 	grantCalls := 0
 	svc := &testableService{
 		repo: newMockRepo(),
-		rewardGrant: func(username string, tokenAmount uint64, assets []core.MintAssetPayload) error {
+		rewardGrant: func(username string, tokenAmount uint64, assets []core.MintAssetPayload) (string, error) {
 			grantCalls++
-			return nil
+			return "", nil
 		},
 	}
 	room, _ := svc.requestEntry([]string{"p1"}, 1)
@@ -478,8 +478,8 @@ func TestMock_CompleteRaid_WithRewardGranter(t *testing.T) {
 func TestMock_CompleteRaid_RewardFailure(t *testing.T) {
 	svc := &testableService{
 		repo: newMockRepo(),
-		rewardGrant: func(username string, tokenAmount uint64, assets []core.MintAssetPayload) error {
-			return fmt.Errorf("chain error")
+		rewardGrant: func(username string, tokenAmount uint64, assets []core.MintAssetPayload) (string, error) {
+			return "", fmt.Errorf("chain error")
 		},
 	}
 	room, _ := svc.requestEntry([]string{"p1"}, 1)