The hook to instantiate Caldera Forms processor classes. See: https://calderaforms.com/doc/caldera_forms_pre_load_processors/ and https://calderaforms.com/doc/creating-caldera-forms-processors-using-caldera_forms_processor_processor-class/

load-processor.php

<?php
add_action( 'caldera_forms_pre_load_processors', function(){
    new CF_Apex_Processor( function_with_processor_config(), function_with_processor_fields(), 'apex-processor' );
});