接入流程文档见：https://blog.csdn.net/change_on/article/details/73881791

支付回调文档见：https://www.freesion.com/article/34141340978/

paypal官方文档：

预下单：https://developer.paypal.com/docs/api/payments/v1/#payment_create

IPN支付回调：https://developer.paypal.com/api/nvp-soap/ipn/IPNIntro/#id08CKFJ00JYK

刚开始看文档以为paypal和支付宝一样，准备使用接收回调的方式处理支付结果的，测试中发现需要调用executePayment接口才能收到回调通知，这样的话不需用到退款等功能的话就没必要接入支付回调了。

在支付成功接口里面处理处理自己的逻辑就行了。

• 获取关键字段

JSONArray transactions = result.getJSONArray("transactions");
JSONObject transaction = transactions.getJSONObject(0);
JSONObject amountObj = transaction.getJSONObject("amount");
JSONArray relatedResources = transaction.getJSONArray("related_resources");
JSONObject sale = relatedResources.getJSONObject(0).getJSONObject("sale");String outOrderIdStr = transaction.getString("custom");// 自己业务的订单号
String totalAmountStr = amountObj.getString("total");// 支付金额
String totalCurrencyStr = transaction.getString("currency");// 支付货币
String payChannelId = sale.getString("id");// 支付渠道订单号

• executePayment接口返回结果

{"update_time": "2023-03-16T14:10:10Z","create_time": "2023-03-16T14:06:59Z","links": [{"method": "GET","rel": "self","href": "https://api.sandbox.paypal.com/v1/payments/payment/PAYID-MQJSFAY41A60628MN734274A"}],"id": "PAYID-MQJSFAY41A60628MN734274A","state": "approved","transactions": [{"payee": {"merchant_id": "ZTV2ES9L5E5PN","email": "xx@cmge.com"},"amount": {"total": "0.10","currency": "USD","details": {"insurance": "0.00","shipping": "0.00","shipping_discount": "0.00","subtotal": "0.10","discount": "0.00","handling_fee": "0.00"}},"related_resources": [{"sale": {"parent_payment": "PAYID-MQJSFAY41A60628MN734274A","amount": {"total": "0.10","currency": "USD","details": {"insurance": "0.00","shipping": "0.00","shipping_discount": "0.00","subtotal": "0.10","discount": "0.00","handling_fee": "0.00"}},"payment_mode": "INSTANT_TRANSFER","update_time": "2023-03-16T14:10:10Z","create_time": "2023-03-16T14:10:10Z","protection_eligibility_type": "ITEM_NOT_RECEIVED_ELIGIBLE,UNAUTHORIZED_PAYMENT_ELIGIBLE","transaction_fee": {"currency": "USD","value": "0.10"},"protection_eligibility": "ELIGIBLE","links": [{"method": "GET","rel": "self","href": "https://api.sandbox.paypal.com/v1/payments/sale/8NU85203XK009112F"}, {"method": "POST","rel": "refund","href": "https://api.sandbox.paypal.com/v1/payments/sale/8NU85203XK009112F/refund"}, {"method": "GET","rel": "parent_payment","href": "https://api.sandbox.paypal.com/v1/payments/payment/PAYID-MQJSFAY41A60628MN734274A"}],"id": "8NU85203XK009112F","state": "completed"}}],"item_list": {"shipping_address": {"country_code": "US","city": "San Jose","state": "CA","recipient_name": "liu nen","postal_code": "95131","line1": "1 Main St"}},"custom": "217255803227471874","description": "goodname"}],"failed_transactions": [],"intent": "sale","payer": {"payment_method": "paypal","status": "VERIFIED","payer_info": {"country_code": "US","last_name": "nen","payer_id": "CRECMZWEPZXA6","shipping_address": {"country_code": "US","city": "San Jose","state": "CA","recipient_name": "liu nen","postal_code": "95131","line1": "1 Main St"},"first_name": "liu","email": "xx@qq.com"}},"cart": "4WX621310W422174Y"
}

写笔记时看到这篇文章，感觉也不错，记录一下

https://blog.csdn.net/MrwanZH/article/details/109540847?spm=1001.2101.3001.6650.1&utm_medium=distribute.pc_relevant.none-task-blog-2%7Edefault%7EOPENSEARCH%7ERate-1-109540847-blog-129717065.pc_relevant_default&depth_1-utm_source=distribute.pc_relevant.none-task-blog-2%7Edefault%7EOPENSEARCH%7ERate-1-109540847-blog-129717065.pc_relevant_default&utm_relevant_index=2