diff --git a/.env.example b/.env.example
new file mode 100644
index 0000000..ddfc488
--- /dev/null
+++ b/.env.example
@@ -0,0 +1,11 @@
+# QuickBooks API Credentials
+QB_CLIENT_ID=your_client_id_here
+QB_CLIENT_SECRET=your_client_secret_here
+QB_REALM_ID=your_realm_id_here
+
+# For Authorization Flow Test
+QB_AUTH_CODE=your_auth_code_here
+
+# For Token Reuse Test
+QB_REFRESH_TOKEN=your_refresh_token_here
+QB_ACCESS_TOKEN=your_access_token_here
diff --git a/.gitignore b/.gitignore
index 6c56eff..1aa06a5 100644
--- a/.gitignore
+++ b/.gitignore
@@ -2,3 +2,6 @@
 
 # IntelliJ
 .idea
+CLAUDE.md
+.claude
+.env
diff --git a/examples/auth_flow_test.go b/examples/auth_flow_test.go
index 5012300..04b0ccc 100644
--- a/examples/auth_flow_test.go
+++ b/examples/auth_flow_test.go
@@ -2,22 +2,30 @@ package examples
 
 import (
 	"fmt"
+	"os"
 	"testing"
 
+	"github.com/joho/godotenv"
 	"github.com/rwestlund/quickbooks-go"
 	"github.com/stretchr/testify/require"
 )
 
 func TestAuthorizationFlow(t *testing.T) {
-	clientId := "<your-client-id>"
-	clientSecret := "<your-client-secret>"
-	realmId := "<realm-id>"
+	_ = godotenv.Load("../.env") // Load .env file if it exists
+
+	clientId := os.Getenv("QB_CLIENT_ID")
+	clientSecret := os.Getenv("QB_CLIENT_SECRET")
+	realmId := os.Getenv("QB_REALM_ID")
+	authorizationCode := os.Getenv("QB_AUTH_CODE")
+
+	if clientId == "" || clientSecret == "" || realmId == "" || authorizationCode == "" {
+		t.Skip("Skipping TestAuthorizationFlow; QB_CLIENT_ID, QB_CLIENT_SECRET, QB_REALM_ID, or QB_AUTH_CODE not set")
+	}
 
 	qbClient, err := quickbooks.NewClient(clientId, clientSecret, realmId, false, "", nil)
 	require.NoError(t, err)
 
 	// To do first when you receive the authorization code from quickbooks callback
-	authorizationCode := "<received-from-callback>"
 	redirectURI := "https://developer.intuit.com/v2/OAuth2Playground/RedirectUrl"
 	bearerToken, err := qbClient.RetrieveBearerToken(authorizationCode, redirectURI)
 	require.NoError(t, err)
diff --git a/examples/reuse_token_test.go b/examples/reuse_token_test.go
index 5691fe1..b984f6c 100644
--- a/examples/reuse_token_test.go
+++ b/examples/reuse_token_test.go
@@ -2,20 +2,30 @@ package examples
 
 import (
 	"fmt"
+	"os"
 	"testing"
 
+	"github.com/joho/godotenv"
 	"github.com/rwestlund/quickbooks-go"
 	"github.com/stretchr/testify/require"
 )
 
 func TestReuseToken(t *testing.T) {
-	clientId := "<your-client-id>"
-	clientSecret := "<your-client-secret>"
-	realmId := "<realm-id>"
+	_ = godotenv.Load("../.env") // Load .env file if it exists
+
+	clientId := os.Getenv("QB_CLIENT_ID")
+	clientSecret := os.Getenv("QB_CLIENT_SECRET")
+	realmId := os.Getenv("QB_REALM_ID")
+	refreshToken := os.Getenv("QB_REFRESH_TOKEN")
+	accessToken := os.Getenv("QB_ACCESS_TOKEN")
+
+	if clientId == "" || clientSecret == "" || realmId == "" || refreshToken == "" || accessToken == "" {
+		t.Skip("Skipping TestReuseToken; required environment variables not set")
+	}
 
 	token := quickbooks.BearerToken{
-		RefreshToken: "<saved-refresh-token>",
-		AccessToken:  "<saved-access-token>",
+		RefreshToken: refreshToken,
+		AccessToken:  accessToken,
 	}
 
 	qbClient, err := quickbooks.NewClient(clientId, clientSecret, realmId, false, "", &token)
diff --git a/go.mod b/go.mod
index ec22901..ebe124a 100644
--- a/go.mod
+++ b/go.mod
@@ -1,10 +1,11 @@
 module github.com/rwestlund/quickbooks-go
 
-go 1.20
+go 1.25
 
 require (
-	github.com/stretchr/testify v1.9.0
-	golang.org/x/oauth2 v0.19.0
+	github.com/joho/godotenv v1.5.1
+	github.com/stretchr/testify v1.11.1
+	golang.org/x/oauth2 v0.35.0
 	gopkg.in/guregu/null.v4 v4.0.0
 )
 
diff --git a/go.sum b/go.sum
index a260b36..c2626c0 100644
--- a/go.sum
+++ b/go.sum
@@ -1,12 +1,15 @@
 github.com/davecgh/go-spew v1.1.1 h1:vj9j/u1bqnvCEfJOwUhtlOARqs3+rkHYY13jYWTU97c=
 github.com/davecgh/go-spew v1.1.1/go.mod h1:J7Y8YcW2NihsgmVo/mv3lAwl/skON4iLHjSsI+c5H38=
-github.com/google/go-cmp v0.5.9 h1:O2Tfq5qg4qc4AmwVlvv0oLiVAGB7enBSJ2x2DqQFi38=
+github.com/joho/godotenv v1.5.1 h1:7eLL/+HRGLY0ldzfGMeQkb7vMd0as4CfYvUVzLqw0N0=
+github.com/joho/godotenv v1.5.1/go.mod h1:f4LDr5Voq0i2e/R5DDNOoa2zzDfwtkZa6DnEwAbqwq4=
 github.com/pmezard/go-difflib v1.0.0 h1:4DBwDE0NGyQoBHbLQYPwSUPoCMWR5BEzIk/f1lZbAQM=
 github.com/pmezard/go-difflib v1.0.0/go.mod h1:iKH77koFhYxTK1pcRnkKkqfTogsbg7gZNVY4sRDYZ/4=
 github.com/stretchr/testify v1.9.0 h1:HtqpIVDClZ4nwg75+f6Lvsy/wHu+3BoSGCbBAcpTsTg=
 github.com/stretchr/testify v1.9.0/go.mod h1:r2ic/lqez/lEtzL7wO/rwa5dbSLXVDPFyf8C91i36aY=
-golang.org/x/oauth2 v0.19.0 h1:9+E/EZBCbTLNrbN35fHv/a/d/mOBatymz1zbtQrXpIg=
-golang.org/x/oauth2 v0.19.0/go.mod h1:vYi7skDa1x015PmRRYZ7+s1cWyPgrPiSYRe4rnsexc8=
+github.com/stretchr/testify v1.11.1 h1:7s2iGBzp5EwR7/aIZr8ao5+dra3wiQyKjjFuvgVKu7U=
+github.com/stretchr/testify v1.11.1/go.mod h1:wZwfW3scLgRK+23gO65QZefKpKQRnfz6sD981Nm4B6U=
+golang.org/x/oauth2 v0.35.0 h1:Mv2mzuHuZuY2+bkyWXIHMfhNdJAdwW3FuWeCPYN5GVQ=
+golang.org/x/oauth2 v0.35.0/go.mod h1:lzm5WQJQwKZ3nwavOZ3IS5Aulzxi68dUSgRHujetwEA=
 gopkg.in/check.v1 v0.0.0-20161208181325-20d25e280405 h1:yhCVgyC4o1eVCa2tZl7eS0r+SDo693bJlVdllGtEeKM=
 gopkg.in/check.v1 v0.0.0-20161208181325-20d25e280405/go.mod h1:Co6ibVJAznAaIkqp8huTwlJQCZ016jof/cbN4VW5Yz0=
 gopkg.in/guregu/null.v4 v4.0.0 h1:1Wm3S1WEA2I26Kq+6vcW+w0gcDo44YKYD7YIEJNHDjg=