session token signature is invalid

[slvzy]

app := &gopify.Gopify{
ApiKey: "xxxx",
ApiSecret: "xxx",
RedirectUrl: "https://example.com/auth/callback",
Scopes: []string{"read_products", "read_orders"},
}
err := app.VerifyTokenSignature("eyJhbGciOiJIUzI1NiIsInR5cCI6IkpXVCJ9.eyJpc3MiOiJodHRwczpcL1wvcm9ib3NlbGx0ZXN0c3RvcmUtMS5teXNob3BpZnkuY29tXC9hZG1pbiIsImRlc3QiOiJodHRwczpcL1wvcm9ib3NlbGx0ZXN0c3RvcmUtMS5teXNob3BpZnkuY29tIiwiYXVkIjoiMWNkNzMzMGNjNjA4MDE0MDc0ZWY5ODdlNDQzOWNkZmYiLCJzdWIiOiI4NTczODU4NjM1MiIsImV4cCI6MTY2OTM2OTA2NiwibmJmIjoxNjY5MzY5MDA2LCJpYXQiOjE2NjkzNjkwMDYsImp0aSI6IjY0Mzc4MjcyLTdlNWMtNGU0ZS1hZmMzLWIwYjEwOWQ1MDYyOCIsInNpZCI6IjFhY2FlYzQzMjRiZWFiNDUxMzExNzE5YWM5MDFhNDQyMGIwMzk1YzhkOGFkMzRlMGEyMGRhMTBiNTQ4YTg3ZWYifQ.mGvOKGkuN1FPitB9WZO6kbrC5_DyGDKWjgA1A0ZcQ4c")
result: session token signature is invalid

Here you can verify the success of the signature