exchange-2.0/app/Http/Resources/WalletResource.php

<?php

namespace App\Http\Resources;

use App\Classes\ValueObjects\Constants\TransactionType;
use Illuminate\Http\Resources\Json\JsonResource;

class WalletResource extends JsonResource
{
    /**
     * Transform the resource into an array.
     *
     * @param  \Illuminate\Http\Request  $request
     * @return array
     */
    public function toArray($request)
    {
        return [
            'id' => $this->id,
            'code' => $this->code,
            'currency_id' => $this->currency_id,
            'amount' => (double) $this->amount,
            'company_id' => (int) $this->owner->id,
            'transactions' => $this->transactions()->orderBy('id', 'DESC')->get(),
            'topup_transactions' => $this->transactions()->where('type', TransactionType::TOP_UP)->orderBy('id', 'DESC')->get(),

            // 'transaction' =>  $this->whenLoaded('transactions', function() {
            //     return [
            //         'topup' => $this->transactions
            //     ];
            // }),
            // 'transaction' // all
            // 'top_transaction' // only topup
        ];
    }
}