invoiceninja/app/Ninja/Repositories/NinjaRepository.php

<?php

namespace App\Ninja\Repositories;

use App\Models\Account;

class NinjaRepository
{
    public function updatePlanDetails($clientPublicId, $data)
    {
        $account = Account::whereId($clientPublicId)->first();

        if (! $account) {
            return;
        }

        $company = $account->company;
        $company->plan = ! empty($data['plan']) && $data['plan'] != PLAN_FREE ? $data['plan'] : null;
        $company->plan_term = ! empty($data['plan_term']) ? $data['plan_term'] : null;
        $company->plan_paid = ! empty($data['plan_paid']) ? $data['plan_paid'] : null;
        $company->plan_started = ! empty($data['plan_started']) ? $data['plan_started'] : null;
        $company->plan_expires = ! empty($data['plan_expires']) ? $data['plan_expires'] : null;
                
        $company->save();
    }
}