the laravel eloquent collection method does not exist

try laravel Appending Values To JSON ref link https://laravel.com/docs/8.x/eloquent-serialization#appending-values-to-json

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/**
     * The accessors to append to the model's array form.
     *
     * @var array
     */
    protected $appends = ['qr_code'];

public function getQrCodeAttribute()
{
    $binCode = $this->code ? $this->code : 123456;
    return $this->attributes['qr_code'] = QrCode::size(200)->generate($binCode);
}

by this $AllBins in this collection new key qr_code will be added

so you can use pluck() to get all qr_code

$qrCodes = $AllBins->pluck('qr_code');