osb/app/Http/Controllers/AccountingController.php

<?php

namespace App\Http\Controllers;

use Illuminate\Support\Collection;

use App\Models\{ProviderOauth,User};

class AccountingController extends Controller
{
	public function __construct()
	{
		$this->middleware('auth');
	}

	/**
	 * Query the accounting system and get a valid list of accounting codes
	 *
	 * @param string $provider
	 * @return Collection
	 */
	public static function list(string $provider): Collection
	{
		// @todo This should be a variable
		$uo = User::findOrFail(1);

		$so = ProviderOauth::where('name',$provider)->singleOrFail();
		if (! ($to=$so->token($uo)))
			abort(500,sprintf('Unknown Tokens for [%s]',$uo->email));

		$api = $to->API();

		return $api->getItems()
			->pluck('pid','Id')
			->transform(function($item,$value) { return ['id'=>$value,'value'=>$item]; })
			->values();
	}
}