如何通过PayPal订单ID获取详细交易信息及付款人数据

// 示例：获取访问令牌（具体实现取决于您的认证逻辑）
public AccessTokenDTO getAuthResponse() throws IOException, InterruptedException {
    // 实际代码会调用PayPal的/v1/oauth2/token端点
    // 并使用您的客户端凭据进行认证
    // 这里仅为示意，假设已有一个方法可以获取到AccessTokenDTO
    return yourAuthService.getAccessToken();
}

import java.io.IOException;
import java.net.URI;
import java.net.http.HttpClient;
import java.net.http.HttpRequest;
import java.net.http.HttpResponse;
import java.util.List;

// 假设这些是您的PayPal API配置
public class PayPalApiConfig {
    public static final String BASE_URL = "https://api-m.sandbox.paypal.com"; // 或生产环境URL
    public enum PayPalEndpoints {
        ORDER_DETAILS("/v2/checkout/orders/{id}");

        public final String path;
        PayPalEndpoints(String path) {
            this.path = path;
        }
    }

    public static String createUrl(String baseUrl, PayPalEndpoints endpoints, String pathVariable){
        String path = endpoints.path.replace("{id}", pathVariable);
        return baseUrl + path;
    }
}

// 假设这是一个服务类
public class PayPalService {

    private final HttpClient httpClient = HttpClient.newHttpClient();
    // private final ObjectMapper objectMapper = new ObjectMapper(); // 用于JSON解析

    // 假设 getAuthResponse() 方法已实现并返回访问令牌
    private AccessTokenDTO getAuthResponse() {
        // ... 实际获取访问令牌的逻辑
        return new AccessTokenDTO("your_access_token_here", "Bearer", 3600); // 示例
    }

    public PayPalOrderResponseDTO getOrderDetails(String orderId) throws IOException, InterruptedException {
        AccessTokenDTO accessTokenDTO = getAuthResponse(); // 获取访问令牌

        // 构建请求URL
        String requestUrl = PayPalApiConfig.createUrl(PayPalApiConfig.BASE_URL, PayPalApiConfig.PayPalEndpoints.ORDER_DETAILS, orderId);

        // 构建HTTP请求
        HttpRequest request = HttpRequest.newBuilder()
                .uri(URI.create(requestUrl))
                .header("Authorization", "Bearer " + accessTokenDTO.accessToken()) // 添加认证头
                .GET() // GET请求
                .build();

        // 发送请求并获取响应
        HttpResponse<String> response = httpClient.send(request, HttpResponse.BodyHandlers.ofString());
        String content = response.body();

        // 检查响应状态码
        if (response.statusCode() != 200) {
            System.err.println("Error fetching order details: " + response.statusCode() + " - " + content);
            throw new IOException("Failed to get order details: " + content);
        }

        // 使用JSON解析库（如Jackson的ObjectMapper）将响应体映射到DTO
        // return objectMapper.readValue(content, PayPalOrderResponseDTO.class);
        // 这里简化为直接返回，实际应用中需要解析
        System.out.println("PayPal Order Details Response: " + content);
        // 假设有一个方法可以解析JSON字符串到DTO
        return parseOrderResponse(content);
    }

    // 示例：AccessTokenDTO 和 PayPalOrderResponseDTO 结构
    record AccessTokenDTO(String accessToken, String tokenType, int expiresIn) {}

    // 简化版解析方法，实际应使用ObjectMapper
    private PayPalOrderResponseDTO parseOrderResponse(String jsonContent) {
        // 实际使用ObjectMapper进行解析
        // 例如: return new ObjectMapper().readValue(jsonContent, PayPalOrderResponseDTO.class);
        // 这里仅为示意，需要完整的DTO定义
        System.out.println("Parsing JSON content (simplified): " + jsonContent);
        // 提取关键信息，例如 payer.email_address
        // 实际应用中会完整映射
        return new PayPalOrderResponseDTO(
            "2023-01-01T00:00:00Z", // creationTime
            "2023-01-01T00:00:00Z", // updateTime
            "ORDER-ID-EXAMPLE",     // id
            null,                   // processingInstruction
            List.of(),              // payPalPurchaseUnits
            List.of(),              // links
            null,                   // paymentSource
            null,                   // intent
            new PayPalPayer(
                "test.payer@example.com", // email_address
                new PayPalPayerName("Given", "Surname"), // name
                null,                   // phone
                null                    // birth_data
            ),
            "COMPLETED"             // status
        );
    }
}

// 示例：PayPalOrderResponseDTO 及其嵌套结构
// 实际应用中会使用 @JsonProperty 注解进行字段映射
record PayPalOrderResponseDTO(
    String creationTime,
    String updateTime,
    String id,
    Object processingInstruction, // 简化为Object
    List<Object> payPalPurchaseUnits, // 简化为List<Object>
    List<Object> links, // 简化为List<Object>
    Object paymentSource, // 简化为Object
    Object intent, // 简化为Object
    PayPalPayer payPalPayer,
    String status
) {}

record PayPalPayer(
    String email_address,
    PayPalPayerName name,
    Object phone, // 简化为Object
    String birth_data
) {}

record PayPalPayerName(
    String given_name,
    String surname
) {}

{
  // ... 其他订单详情
  "payer": {
    "email_address": "test.payer@example.com",
    "name": {
      "given_name": "John",
      "surname": "Doe"
    },
    "phone": {
      "phone_type": "HOME",
      "phone_number": {
        "national_number": "354678768"
      }
    },
    "birth_data": "2023-03-01"
  },
  // ... 其他订单详情
  "purchase_units": [
    // 包含交易金额、商品详情等信息
  ]
}