# Identifying the Account

When you create a channel for push notification we recommend you include an identifier in the `callback_url`. So instead of having one URL for all callbacks like,

```
https://api.company.com/all_cronofy_callbacks
```

you would instead set the callback URL to be something like:

```
https://api.company.com/cronofy_callbacks/{user_id}
```

We recommend using something non-sensitive as the identifier like an internal, non-guessable ID.



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