error[E0308]: mismatched types
  --> src/client.rs:85:9
   |
84 |     pub fn client_secret(&self) -> &str {
   |                                    ---- expected `&str` because of return type
85 |         &self.client_secret
   |         ^^^^^^^^^^^^^^^^^^^ expected `&str`, found `&Secret<String>`
   |
   = note: expected reference `&str`
              found reference `&secrecy::Secret<std::string::String>`