no-issue
This simplifies the handling of updating redirects for a code, and
doesn't affect our application layer because we never have the need to
change a code twice.
In future this should be replaced with events at the domain level - so
that we do not have to track changed properties and instead a redirect
service can listen to events, which would be dispatched on a successful
save by the repository.
no-issue
This adds the concept of "Value Objects" to an Offers properties,
allowing us to move validation out and ensure that an Offer will only
ever have valid properties, without having to duplicate checks - or
leave them to the persistent layer. This means we can fail early, as
well as write unit tests for all of our validation.
refs https://github.com/TryGhost/Team/issues/1090
When creating checkout session we will need to be able to look up Offers
from the OfferRepository. This exposes the repository so that it can be
passed as a dependency elsewhere.
