How are API's implemented in the CiviCRM Codebase? I have a idea of basic structue user <-> api <-> BAO <-> DAO <-> mysql but I guess there is more to this than just this structure. Thanks in Advance!
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Did you have any specific questions that were not covered in the Developers Guide? – Luke Stewart Feb 26 '20 at 20:35
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Welcome to CiviCRM SE! The first place to look for this information is in the relevant section of the developers guide at https://docs.civicrm.org/dev/en/latest/api/
I just finished writing a man page for this: APIv4 Architecture
Note that there are currently 2 versions of the CiviCRM API. APIv3 has been around for years, and APIv4 is fairly new. But they both rely on core BAO classes for writing data, and a query builder for fetching data.
