Google Pay 谷歌支付（gateway = stripe）

Google pay 国际版开发

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一、官网地址（科学上网）

官方对接文档 https://developers.google.com/pay/api/android/overview
Stripe对接Google Pay https://stripe.com/docs/google-pay
Stripe验证支付 https://stripe.com/docs/payments/accept-a-payment?integration=elements
Stripe管理后台 https://dashboard.stripe.com/dashboard

二、接入流程

三、主要流程

1、服务器请求orderId

2、调用Google Pay

3、通过Stripe完成支付

4、服务器完成验证

四、主要代码实现（1、4主要是服务器流程，以下主要是2、3流程）

项目配置

build.gradle 添加
    implementation 'com.google.android.gms:play-services-wallet:18.1.2'
    implementation 'androidx.appcompat:appcompat:1.2.0'
    implementation 'com.stripe:stripe-android:16.0.1'
AndroidManifest.xml 的 application添加
    <meta-data
          android:name="com.google.android.gms.wallet.api.enabled"
          android:value="true" />

调用Google Pay

    @RequiresApi(api = Build.VERSION_CODES.N)
    private void payWithGoogle( double price) {
        if (paymentsClient == null) {
            paymentsClient = createPaymentsClient(mActivity);
        }
        // 主要是Google Pay一些参数设置
        Optional<JSONObject> paymentDataRequestJson = createPaymentDataRequest(price);
        if (!paymentDataRequestJson.isPresent()) {
            return;
        }
        PaymentDataRequest request =
                PaymentDataRequest.fromJson(paymentDataRequestJson.get().toString());
        if (request != null) {
            if (mActivity!=null){
                mActivity.showCircle2Loading();
            }
          // 调起 Google Pay 
            AutoResolveHelper.resolveTask(
                    paymentsClient.loadPaymentData(request),
                    mActivity,
                    LOAD_PAYMENT_DATA_REQUEST_CODE
            );
        }
    }

Google Pay 基本设置

    @RequiresApi(api = Build.VERSION_CODES.N)
    private Optional<JSONObject> createPaymentDataRequest(double priceCents) {
        try {
            JSONObject paymentDataRequest = getBaseRequest();
            // 指定是否支持 Google Pay API 所支持的一种或多种付款方式。
            paymentDataRequest.put("allowedPaymentMethods", new JSONArray().put(getCardPaymentMethod()));
            // 有关根据用户是否同意交易来为交易授权的详细信息。包含总价和价格状态
            paymentDataRequest.put("transactionInfo", getTransactionInfo(priceCents));
            //商家信息
            paymentDataRequest.put("merchantInfo", getMerchantInfo());
            paymentDataRequest.put("shippingAddressRequired", false);
            paymentDataRequest.put("emailRequired", false);
            return Optional.of(paymentDataRequest);

        } catch (JSONException e) {
            return Optional.empty();
        }
    }
   private JSONObject getCardPaymentMethod() throws JSONException {
        JSONObject cardPaymentMethod = getBaseCardPaymentMethod();
        // 设置stripe为付款方式
        JSONObject tokenizationSpec = new GooglePayConfig(LIVE_API).getTokenizationSpecification();
        cardPaymentMethod.put("tokenizationSpecification", tokenizationSpec);
        return cardPaymentMethod;
    }

    /**
     * 金钱信息
     */
    private JSONObject getTransactionInfo(double price) throws JSONException {
        JSONObject transactionInfo = new JSONObject();
        transactionInfo.put("totalPrice", price+"");
        transactionInfo.put("totalPriceStatus", "FINAL");
        transactionInfo.put("countryCode", COUNTRY_CODE);
        transactionInfo.put("currencyCode", CURRENCY_CODE);
        transactionInfo.put("checkoutOption", "COMPLETE_IMMEDIATE_PURCHASE");

        return transactionInfo;
    }

    /**
     * 商家信息
     * merchantId 商家Id
     */
    private JSONObject getMerchantInfo() throws JSONException {
        return new JSONObject().put("merchantName", "Guruji").put("merchantId", "填写商家ID");
    }
    private JSONObject getBaseRequest() throws JSONException {
        return new JSONObject()
                .put("apiVersion", 2)
                .put("apiVersionMinor", 0);
    }

Google Pay返回数据

{
  "apiVersionMinor": 0,
  "apiVersion": 2,
  "paymentMethodData": {
    "description": "中国招商银行 (CMB) •••• 5019",
    "tokenizationData": {
      "type": "PAYMENT_GATEWAY",
      "token": "{\n  \"id\": \"tok_1HcQIMBcf7rsT369XhdHf1aI\",\n  \"object\": \"token\",\n  \"card\": {\n    \"id\": \"card_1HcQIMBcf7rsT369lDDy6PIM\",\n    \"object\": \"card\",\n    \"address_city\": null,\n    \"address_country\": null,\n    \"address_line1\": null,\n    \"address_line1_chec