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I am trying to override the vendor/magento/module-inventory-in-store-pickup/Model/GetPickupLocations.php file
I have copied it to app/design/frontend/Magento/child_theme/Magento_InventoryInStorePickup/Model/GetPickupLocations.php
but it doesn't seem to work, have I copied it to the correct location?
If you want to override model (or extend) you should to create your own module in app/code/VendorName/InventoryInStorePickup where you define plugin or preference in etc/di.xml file.
Remember that using preferences and overwriting the entire model is not the best solution.
Why you want to override whole model? What you want to do? Maybe all you need to do is create a plugin for an interesting method from GetPickupLocations model?
First, take a look how to create basic module: https://www.cloudways.com/blog/create-module-in-magento-2/
Next, read how to create plugin for interesting method https://developer.adobe.com/commerce/php/development/components/plugins/
