Prepare for solidus 3.0

[SamuelMartini]

Prepare extension for solidus-3.0
ref #51

[jarednorman]

You've probably already taken a look at this, but we use this gem on a few stores and there's some question as to how to migrate away from price_in. Our thought was that the price selector API should return a price rather than a Spree::Money object so that extensions like this one can still work.

• initial discussion
• PR from that

[SamuelMartini]

You've probably already taken a look at this, but we use this gem on a few stores and there's some question as to how to migrate away from price_in. Our thought was that the price selector API should return a price rather than a Spree::Money object so that extensions like this one can still work.

* [initial discussion](https://github.com/solidusio/solidus/discussions/3919)

* [PR from that](https://github.com/solidusio/solidus/pull/3925)

Hey!
Thank you for the heads up! I'll follow the PR 👍

[stale]

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