Custom modules

add_action( 'plugins_loaded', function () {
    if ( ! function_exists( 'epc_register_module' ) ) {
        return;
    }

    epc_register_module(
        'my-crm',
        dirname( __FILE__ ) . '/includes/class-epc-module-my-crm.php',
        'EPC_Module_My_CRM'
    );
}, 10 );

class EPC_Module_My_CRM extends EPC_Module {

    public function get_slug() {
        return 'my-crm';
    }

    public function get_label() {
        return __( 'My CRM', 'my-plugin' );
    }

    public function is_available() {
        return class_exists( 'My_CRM_Plugin' );
    }

    public function get_source_fields() {
        return array(
            'email'     => __( 'Email', 'my-plugin' ),
            'full_name' => __( 'Full name', 'my-plugin' ),
        );
    }

    public function get_mappable_entities() {
        return array(
            array( 'id' => 1, 'label' => __( 'Gold plan', 'my-plugin' ) ),
        );
    }

    public function get_entity_label( $entity_id ) {
        return 'Plan #' . (int) $entity_id;
    }

    public function sync_by_source_id( $source_id, $mode = 'sync' ) {
        return EPC_Pass_Service::sync_pass(
            $this->get_slug(),
            $source_id,
            $entity_id,
            $user_id,
            $mapping,
            $source_values,
            $mode
        );
    }

    protected function register_event_hooks() {
        add_action( 'my_crm_subscription_active', array( $this, 'on_active' ), 10, 1 );
    }

    public function on_active( $source_id ) {
        $this->sync_by_source_id( (int) $source_id, 'sync' );
    }
}