You do not need to modify code in your price/sku retriever.
If you were using the Mageplaza Better Tier Price module you now have to implement your update class yourself or upgrade to the JustBetter Magento 2 Customer Pricing module. See the readme on how you can implement your own updater class, you can use the default class from version 1.x as a template.
3.x introduces a complete refactor of the package structure.
A few highlights:
- Simplified implementation
- Support updating via Magento 2 bulk async requests
- Removed error logger, replaced with activity log
- Dropped support for Laravel 10
The price retriever and SKU retriever classes all have been merged into a single repository class. Refer to the readme on how to implement this.
The configuration file has been stripped, most of the configuration is now done in the repository class.
A lot of classes have been renamed, be sure to update your scheduler and check all classes that you use.
The price model has been renamed from MagentoCustomerPrice to CustomerPrice.