Transaction.php

<?php
// src/App/Entity
namespace App\Entity;

use Beelab\PaypalBundle\Entity\Transaction as BaseTransaction;
use Doctrine\Common\Collections\ArrayCollection;
use Doctrine\Common\Collections\Collection;
use Doctrine\ORM\Mapping as ORM;

/**
 * @ORM\Table()
 * @ORM\Entity()
 */
class Transaction extends BaseTransaction
{
    // if you need other properties, or relationships, add them here...

    /**
     * @ORM\Column(type="text", nullable=TRUE)
     */
    protected $description;



    /**
     *
     * @ORM\OneToMany(targetEntity="Item", mappedBy="transaction")
     */
    protected $items;

    public function __construct() {
        $this->items=new ArrayCollection();
    }


    /**
     * @ORM\Column(type="float", nullable=TRUE)
     */
    private $shippingAmount;

    public function getDescription(): ?string
    {
        return $this->description;
    }

    public function setDescription(?string $description): self
    {
        $this->description = $description;

        return $this;
    }

    public function getShippingAmount(): string
    {
        return '';
    }

    public function setShippingAmount(?float $shippingAmount): self
    {
        $this->shippingAmount = $shippingAmount;

        return $this;
    }


    public function getItems(): array
    {
        return [];
    }

    public function addItem(Item $item): self
    {
        if (!$this->items->contains($item)) {
            $this->items[] = $item;
            $item->setTransaction($this);
        }

        return $this;
    }

    public function removeItem(Item $item): self
    {
        if ($this->items->contains($item)) {
            $this->items->removeElement($item);
            // set the owning side to null (unless already changed)
            if ($item->getTransaction() === $this) {
                $item->setTransaction(null);
            }
        }

        return $this;
    }


}