fix: make stripe webhooks explicitly toggleable with mandatory secret validation

backend/src/infra.rs

@@ -169,7 +169,7 @@ impl Infra {
         if !response.status().is_success() {
             let status = response.status();
             let body = response.text().await.unwrap_or_default();
-            anyhow::bail!("zooid sync returned {}: {}", status, body)
+            anyhow::bail!("zooid sync returned {status}: {body}")
         }
         Ok(())
     }