1. 準備工作，先到iTunesConnect 上進行新增內購專案和沙盒測試賬號

建立APP 內購專案

選擇其中一種型別，進行建立

填寫內購專案的內容(其中的產品 ID 記住，在接下來有很多地方需要用到)

螢幕快照一定要選到，不然會顯示該內購專案元資料丟失

狀態顯示為黃色：準備提交才是正確的

2. 建立沙盒賬號

在建立測試員的時候，記住那個郵箱不能填你已經有的 AppleID 的郵箱，填好後會有一篇驗證資訊發到你剛剛填寫的郵箱，驗證後就可以用了

3. unity 裡面的操作

將 IAP 相關的檔案匯入 unity 中

點選 in-App-Purchasing進去

保證 Analytics 和in-App-Purchasing是開啟狀態就可以了

新增 IAPButton

填寫 IAPButton 裡面的資訊

• 新建一個指令碼

using System.Collections;
using System.Collections.Generic;
using UnityEngine;
using UnityEngine.Purchasing;
using UnityEngine.UI;
using System.Text;
using System;
using MiniJSON;
using UnityEngine.Purchasing.Security;


public class PurchaseManager : MonoBehaviour
 
, IStoreListener
{
	
	
	private IStoreController controller;
	ConfigurationBuilder builder;

	private IStoreController m_Controller;
	private IAppleExtensions m_AppleExtensions;

	void Start()
	{
		var module = StandardPurchasingModule.Instance();
		builder = ConfigurationBuilder.Instance(module);
		builder.
 
AddProduct("產品 ID", ProductType.Subscription);
		UnityPurchasing.Initialize(this, builder);


	}

	/// <summary>
	/// Called when Unity IAP is ready to make purchases.
	/// </summary>
	public void OnInitialized(IStoreController controller, IExtensionProvider extensions)
	{
		this.controller = controller;
		m_Controller = controller;
		m_AppleExtensions = extensions.GetExtension<IAppleExtensions> ();
		m_AppleExtensions.RegisterPurchaseDeferredListener (OnDeferred);
	}

	/// <summary>
	/// Called when Unity IAP encounters an unrecoverable initialization error.
	///
	/// Note that this will not be called if Internet is unavailable; Unity IAP
	/// will attempt initialization until it becomes available.
	/// </summary>
	public void OnInitializeFailed(InitializationFailureReason error)
	{
	}

	/// <summary>
	/// Called when a purchase completes.
	///
	/// May be called at any time after OnInitialized().
	/// </summary>
	//這個函式就是購買成功後自動呼叫的函式
	public PurchaseProcessingResult ProcessPurchase(PurchaseEventArgs e)
	{
		Debug.Log ("IAP成功");
		if (Application.platform == RuntimePlatform.IPhonePlayer ||
			Application.platform == RuntimePlatform.tvOS) {
			string transactionReceipt = m_AppleExtensions.GetTransactionReceiptForProduct (e.purchasedProduct);
			Debug.Log (transactionReceipt);
			//這裡的transactionReceipt是 Base64加密後的交易收據，將這個收據傳送給遠端伺服器就會得到訂單資訊的 Json 資料

		}    
		return PurchaseProcessingResult.Complete;
	}

	/// <summary>
	/// Called when a purchase fails.
	/// </summary>
	public void OnPurchaseFailed(Product item, PurchaseFailureReason r)
	{
		Debug.Log ("IAP失敗");
		Debug.Log ("失敗原因："+r.ToString());
	}


//將這個函式掛載到需要進行內購的 UI（Button）上
	public void OnPurchaseClicked(string productId)
	{
		controller.InitiatePurchase(productId);
	}

		
	private void OnDeferred (Product item)
	{
		Debug.Log ("Purchase deferred: " + item.definition.id);
	}
}
	

在要進行內購的 Button 上進行掛載方法

4. 打包到 Xcode 裡面進行沙盒測試

在執行之前記得把 IAP 開啟，還有將真機的 AppleID登出再進行測試

5. 驗證訂單資訊

在購買成功後自動呼叫的函式裡面

public PurchaseProcessingResult ProcessPurchase(PurchaseEventArgs e)
	{
		Debug.Log ("IAP成功");
		if (Application.platform == RuntimePlatform.IPhonePlayer ||
			Application.platform == RuntimePlatform.tvOS) {
			string transactionReceipt = m_AppleExtensions.GetTransactionReceiptForProduct (e.purchasedProduct);
			Debug.Log (transactionReceipt);
			//這裡的transactionReceipt是 Base64加密後的交易收據，將這個收據傳送給遠端伺服器就會得到訂單資訊的 Json 資料

		}    
		return PurchaseProcessingResult.Complete;
	}

在正式伺服器中(已上線Appstore)，傳送transactionReceipt到蘋果的正式伺服器（ https://buy.itunes.apple.com/verifyReceipt ）驗證
驗證後返回的Json 資料如下：

{
    "receipt": {
        "original_purchase_date_pst": "2017-11-15 15:25:20 America/Los_Angeles",
        "purchase_date_ms": "1510788320209",
        "unique_identifier": "0ea7808637555b2c633eb07aa1cb0894c821a6f9",
        "original_transaction_id": "1000000352597239",
        "bvrs": "0",
        "transaction_id": "1000000352597239",
        "quantity": "1",
        "unique_vendor_identifier": "01B57C2E-9E91-42FF-9B0D-4983175D6694",
        "item_id": "1141751870",
        "original_purchase_date": "2017-11-15 23:25:20 Etc/GMT",
        "product_id": "100.gold.coins",
        "purchase_date": "2017-11-15 23:25:20 Etc/GMT",
        "is_trial_period": "false",
        "purchase_date_pst": "2017-11-15 15:25:20 America/Los_Angeles",
        "bid": "com.unity3d.unityiap.demo",
        "original_purchase_date_ms": "1510788320209"
    },
    "status": 0
}