add ticket purchase page

Co-authored-by: Jan-Marlon Leibl <jleibl@proton.me>
Reviewed-on: http://git.simonis.lol/projects/abiball/pulls/13
Reviewed-by: jank1619 <jan@kjan.email>

src/Entity/Payment.php

@@ -0,0 +1,66 @@
+<?php
+
+namespace App\Entity;
+
+use App\Repository\PaymentRepository;
+use Doctrine\ORM\Mapping as ORM;
+
+#[ORM\Entity(repositoryClass: PaymentRepository::class)]
+class Payment
+{
+    #[ORM\Id]
+    #[ORM\GeneratedValue]
+    #[ORM\Column]
+    private ?int $id = null;
+
+    #[ORM\Column(length: 255)]
+    private ?string $sessionId = null;
+
+    #[ORM\Column]
+    private ?bool $completed = null;
+
+    #[ORM\OneToOne(inversedBy: 'payment', cascade: ['persist', 'remove'], fetch: 'EAGER')]
+    #[ORM\JoinColumn(nullable: false)]
+    private ?Customer $customer = null;
+
+    public function getId(): ?int
+    {
+        return $this->id;
+    }
+
+    public function getSessionId(): ?string
+    {
+        return $this->sessionId;
+    }
+
+    public function setSessionId(string $sessionId): static
+    {
+        $this->sessionId = $sessionId;
+
+        return $this;
+    }
+
+    public function isCompleted(): ?bool
+    {
+        return $this->completed;
+    }
+
+    public function setCompleted(bool $completed): static
+    {
+        $this->completed = $completed;
+
+        return $this;
+    }
+
+    public function getCustomer(): ?Customer
+    {
+        return $this->customer;
+    }
+
+    public function setCustomer(Customer $customer): static
+    {
+        $this->customer = $customer;
+
+        return $this;
+    }
+}