ldc-web/app/Http/Middleware/ApiCheckCredentialMiddleware.php

<?php

namespace App\Http\Middleware;

class ApiCheckCredentialMiddleware
{
    /**
     * Handle an incoming request.
     *
     * @param  mixed    $request
     * @param  \Closure $next
     * @return mixed
     */
    public function handle(mixed $request, \Closure $next)
    {
        if ($request->header('Authorization') !== \config('api.key')) {
            return response('Unauthorized', 401);
        }

        /** @var \Illuminate\Http\Request $request */
        return $next($request);
    }
}