Blocks can be executed before or after every API call, using `before`, `after`, `before_validation` and `after_validation`.

Before and after callbacks execute in the following order:

1. `before`
2. `before_validation`
3. validations
4. `after_validation`
5. _the API call_
6. `after`

Steps 4, 5 and 6 only happen if validation succeeds.