diff --git a/go.mod b/go.mod
index 93e7008..1a86f9a 100644
--- a/go.mod
+++ b/go.mod
@@ -17,6 +17,7 @@ require (
 
 require (
 	github.com/google/go-cmp v0.7.0 // indirect
+	github.com/stripe/stripe-go/v79 v79.12.0 // indirect
 	github.com/tidwall/gjson v1.18.0 // indirect
 	github.com/tidwall/match v1.2.0 // indirect
 	github.com/tidwall/pretty v1.2.1 // indirect
diff --git a/internal/server/handle_stripe_webhook_test.go b/internal/server/handle_stripe_webhook_test.go
index 8472bda..9e9f038 100644
--- a/internal/server/handle_stripe_webhook_test.go
+++ b/internal/server/handle_stripe_webhook_test.go
@@ -2,7 +2,9 @@ package server
 
 import (
 	"context"
+	"encoding/hex"
 	"encoding/json"
+	"fmt"
 	"net/http"
 	"net/http/httptest"
 	"strings"