直接购买链接获取接口

import com.alipay.api.AlipayConfig;
import com.alipay.api.AlipayClient;
import com.alipay.api.DefaultAlipayClient;
import com.alipay.api.request.AlipayAipayNowpayPurchaseCreateRequest;
import com.alipay.api.response.AlipayAipayNowpayPurchaseCreateResponse;

public class NowpayExample {
    public static void main(String[] args) throws Exception {
        AlipayConfig config = new AlipayConfig();
        config.setServerUrl("https://openapi.alipay.com/gateway.do");
        config.setAppId(System.getenv("ALIPAY_APP_ID"));
        config.setPrivateKey(System.getenv("ALIPAY_PRIVATE_KEY"));
        config.setAlipayPublicKey(System.getenv("ALIPAY_PUBLIC_KEY"));
        config.setFormat("json");
        config.setCharset("UTF-8");
        config.setSignType("RSA2");
        AlipayClient client = new DefaultAlipayClient(config);

        AlipayAipayNowpayPurchaseCreateRequest request = new AlipayAipayNowpayPurchaseCreateRequest();
        request.setBizContent("{\"out_request_no\":\"purchase_20260907_000001\",\"out_product_id\":\"app_writing_001\",\"external_owner_id\":\"creator_001\",\"external_buyer_id\":\"user_001\",\"sku_id\":\"S0806000200863003\",\"callback_url\":\"https://platform.example.com/nowpay/purchase-return\"}");
        // 仅在已获授权的第三方代调用场景设置 app_auth_token。
        String appAuthToken = System.getenv("ALIPAY_APP_AUTH_TOKEN");
        if (appAuthToken != null && !appAuthToken.isEmpty()) {
            request.putOtherTextParam("app_auth_token", appAuthToken);
        }
        AlipayAipayNowpayPurchaseCreateResponse response = client.execute(request);
        if (!response.isSuccess()) {
            // 按 code/sub_code 处理；结果未知时保留原业务请求号。
            System.out.println(response.getCode() + ":" + response.getSubCode());
            return;
        }
        // 网关成功后，按本页“结果处理”读取业务字段。
        System.out.println(response.getBody());
    }
}

{
  "alipay_aipay_nowpay_purchase_create_response": {
    "code": "10000",
    "msg": "Success",
    "purchase_url": "alipays://platformapi/startapp?appId=2021006180624128&page=pages%2Forder%2Findex%3FpurchaseLinkId%3DSAMPLE_LINK_ID",
    "purchase_qr_code": "https://mobilecodec.alipay.com/show.htm?code=SAMPLE_QR_CODE",
    "expire_time": "2026-09-07 10:30:00",
    "charging_option": {
      "sku_id": "S0806000200863003",
      "plan_id": "PI0806000200864210",
      "display_name": "20次包",
      "billing_mode": "QUANTITY",
      "price": "1.00",
      "currency": "CNY",
      "price_version": 1,
      "entitlement_rule": "QUOTA",
      "quota_unit": "COUNT",
      "quota_amount": 20
    }
  },
  "sign": "RESPONSE_SIGNATURE_PLACEHOLDER"
}