* :doc:`/reference/creating_test_doubles` * :doc:`/reference/expectations` * :doc:`/reference/argument_validation` * :doc:`/reference/alternative_should_receive_syntax` * :doc:`/reference/spies` * :doc:`/reference/partial_mocks` * :doc:`/reference/protected_methods` * :doc:`/reference/public_properties` * :doc:`/reference/public_static_properties` * :doc:`/reference/pass_by_reference_behaviours` * :doc:`/reference/demeter_chains` * :doc:`/reference/final_methods_classes` * :doc:`/reference/magic_methods` * :doc:`/reference/phpunit_integration`
Kueue Pay API responses include standard HTTP status codes to indicate the success or failure of a request. Successful responses will have a status code of 200 OK, while various error conditions will be represented by different status codes along with error messages in the response body.