Hey @AngeloSantos,
Taking a bit of a guess here as the original post doesn't have question, however this sounds like a fairly common/standard API deprecation notice. Usually this type of message will display in a store Admin when custom app is making a deprecated call, but there are also cases where similar updates can be sent via email, either by merchants or developers.
If this is concerning an app that you/your team developed (eg. custom app created in the partner dashboard).
We offer an extensive collection of development docs outlining an overview of api versioning on Shopify, some best practices on how to approach updates, and for partners a breakdown of the API health report dashboard.
If this is an app that was built by a developer for your store (eg. a custom apps created in the store admin ).
We suggest connecting with whomever who built the app originally and/or whomever currently maintains the application - more on working with custom apps here.
Finally, we can offer a few suggestions based on common questions our team sees here in the forums. The best approach here is generally updating the app to the most recent version, a great way to get a bit ahead in schedule. Also, it helps ensure that all endpoint URLs include a version in the path, this avoids the expected 'fall back' functionality outlined in our guide - more info here.
Hope this offers a head start - cheers!
