Tests and package name updated

Samples~/Example/.sample.json

@@ -0,0 +1,4 @@
+{
+	"displayName":"Example Sample",
+	"description": "Replace this string with your own description of the sample. Delete the Samples folder if not needed."
+}

Samples~/Example/SamplePayment.cs

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+using System;
+using System.Threading;
+using Cysharp.Threading.Tasks;
+using UnityEngine;
+using UnityEngine.UI;
+
+namespace Darkmatter.Fonepay.Samples
+{
+    /// <summary>
+    /// Minimal end-to-end sample: request QR, render to Image, await payment,
+    /// support cancellation via a cancel button.
+    /// </summary>
+    public class SamplePayment : MonoBehaviour
+    {
+        [SerializeField] private Image qrImage;
+        [SerializeField] private GameObject successObject;
+        [SerializeField] private GameObject failedObject;
+        [SerializeField] private Button payButton;
+        [SerializeField] private Button cancelButton;
+        [SerializeField] private float amount = 1f;
+
+        private CancellationTokenSource _payCts;
+
+        private void Start()
+        {
+            payButton.onClick.AddListener(() => InitiatePayment().Forget());
+            if (cancelButton != null)
+                cancelButton.onClick.AddListener(() => _payCts?.Cancel());
+        }
+
+        private async UniTask InitiatePayment()
+        {
+            var fonepay = new FonepayClient();
+            _payCts = CancellationTokenSource.CreateLinkedTokenSource(destroyCancellationToken);
+
+            try
+            {
+                var qr = await fonepay.PurchaseAsync(
+                    new QrRequest { amount = amount, remarks1 = "sample" },
+                    _payCts.Token);
+
+                if (qr.qrCode != null)
+                {
+                    qrImage.sprite = Sprite.Create(
+                        qr.qrCode,
+                        new Rect(0, 0, qr.qrCode.width, qr.qrCode.height),
+                        new Vector2(0.5f, 0.5f));
+                    qrImage.gameObject.SetActive(true);
+                }
+
+                var payment = await fonepay.AwaitPaymentAsync(
+                    qr.thirdpartyQrWebSocketUrl,
+                    onQrVerified: v => Debug.Log($"Fonepay QR verified: {v}"),
+                    ct: _payCts.Token);
+
+                Debug.Log($"Payment frame: {JsonUtility.ToJson(payment)}");
+                ShowResult(payment.Outcome == PaymentOutcome.Complete);
+            }
+            catch (OperationCanceledException)
+            {
+                Debug.Log("Payment cancelled.");
+                ShowResult(false);
+            }
+            catch (FonepayError e)
+            {
+                Debug.LogError($"Fonepay API error {e.ErrorCode}: {e.Message}");
+                ShowResult(false);
+            }
+            catch (InvalidOperationException e)
+            {
+                Debug.LogWarning($"Websocket closed early: {e.Message}");
+                ShowResult(false);
+            }
+            finally
+            {
+                _payCts.Dispose();
+                _payCts = null;
+            }
+        }
+
+        private void ShowResult(bool ok)
+        {
+            qrImage.gameObject.SetActive(false);
+            if (successObject != null) successObject.SetActive(ok);
+            if (failedObject != null) failedObject.SetActive(!ok);
+        }
+    }
+}