adrema/app/Initialize/InitializeCourses.php

<?php

namespace App\Initialize;

use App\Course\Models\Course;
use Zoomyboy\LaravelNami\Api;

class InitializeCourses {

    private Api $api;

    public function __construct(Api $api) {
        $this->api = $api;
    }

    public function handle(): void
    {
        $this->api->courses()->each(function($course) {
            Course::create(['nami_id' => $course->id, 'name' => $course->name]);
        });
    }
}