java 服务端接入Google play 结算

google play 结算集成文档：https://developer.android.google.cn/google/play/billing/integrate?hl=zh-cn

google play 结算是用于应用内的虚拟商品支付（与google pay api是有区别的），发起支付与付款流程有app端完成。

服务端需要提供给app端接口有2个：创建自己系统的订单、app端支付完后验证支付状态并处理购买交易。

支付流程（一次性消耗商品）

1.app 查询google play 后台配置好的商品

2.用户选择商品，app请求服务端生成创建商户订单

3.app端向google play 传入商户订单id并发起支付，用户支付

4.app收到支付成功结果，将相关信息传入服务端

5.服务端请求google api 验证商品交易状态

6.服务端请求google api 消耗订单

1.创建系统订单

商户订单id创建逻辑跟自己系统业务相关，不列具体代码，只要返回订单id给app即可。

app端购买商品时传入商户订单id，使商户系统订单id与google 产生对应关系。

经参考网上相关文章学到，app端可以用以下参数传递商户订单id ：

setObfuscatedProfileId(orderId) 

2.支付状态并处理购买交易

2.1 验证购买商品状态

2.2 一次消耗商品确认消耗（消耗就相当于是订单确认，如果没有确认google会在3天后自动退款，商品也无法再次购买）

用户在app端支付完后，会返回购买token给app，app将对应参数传给服务端接口，服务端请求google api 查询购买产品（purchases.products.get），判断交易状态并处理自己系统业务，然后请求消耗订单（purchases.products.consume）。

引入sdk

<dependency>
			<groupId>com.google.apis</groupId>
			<artifactId>google-api-services-androidpublisher</artifactId>
			<version>v3-rev20230406-2.0.0</version>
	
		</dependency>

<dependency>
			<groupId>com.google.auth</groupId>
			<artifactId>google-auth-library-oauth2-http</artifactId>
			<version>1.3.0</version>
		</dependency>

   
    public void checkOrder(String packageName ,String productId,String purchaseToken) throws Exception {
        ProductPurchase purchase = get(packageName ,productId,purchaseToken);
        //订单状态为(0.已购买1.已取消2.待处理),消费状态(0.尚未消耗1.已消耗)
        Integer purchaseState = purchase.getPurchaseState();
        Integer consumState = purchase.getConsumptionState();
     
        String purchaseOrderId = purchase.getObfuscatedExternalProfileId();

        if(0 != purchaseState){
            //未完成支付，返回
          return;
        }

              //处理系统业务
        if(0== consumState ){
        consume(packageName ,productId,purchaseToken);
        }
        
    }


//初始化AndroidPublisher 
   private AndroidPublisher buildAndroidPublisher(){
        try {
            List<String> scopes = Lists.newArrayList(AndroidPublisherScopes.ANDROIDPUBLISHER);
                InputStream inputStream = this.class.getResourceAsStream("api秘钥json文件");
                credentials = GoogleCredentials.fromStream(inputStream).createScoped(scopes);
GsonFactory jsonFactory = GsonFactory.getDefaultInstance();
            HttpRequestInitializer requestInitializer = new HttpCredentialsAdapter(credentials);
            HttpTransport httpTransport = GoogleNetHttpTransport.newTrustedTransport();
            AndroidPublisher publisher = new AndroidPublisher.Builder(httpTransport, jsonFactory, requestInitializer).build();
            return publisher;
        }catch (Exception e){
           
        }
    }


public ProductPurchase get(String packageName ,String productId,String purchaseToken) throws Exception{
        ProductPurchase purchase = null;
        try{
           
            AndroidPublisher publisher = buildAndroidPublisher();
            AndroidPublisher.Purchases.Products products = publisher.purchases().products();
            AndroidPublisher.Purchases.Products.Get productRequest = products.get(packageName,productId,purchaseToken);
            purchase = productRequest.execute();    
        }catch (Exception ex) {
          
        }
         return purchase;
    }


 @Override
    public void consume(String packageName ,String productId,String purchaseToken) throws Exception{
        try{
         
            AndroidPublisher publisher = buildAndroidPublisher();
            AndroidPublisher.Purchases.Products products = publisher.purchases().products();
            AndroidPublisher.Purchases.Products.Consume consumeRequest = products.consume(packageName,productId,purchaseToken);
        
            consumeRequest.execute();
        } catch (Exception ex) {
          
        }
    }

3.创建服务账号请求api接口密钥

参考 https://blog.csdn.net/qq_37611096/article/details/118030549