Paypal自适应/链式支付工作流

首先，我对贝宝自适应支付有点陌生，直到现在我只使用RESTapi。

在实现自适应支付时，我无法理解应用程序的完整流程。

在RESTapi中，我将用户导航到他付款的贝宝页面，并将其重定向到我的页面，在那里我可以对结果做出反应。

使用自适应支付，用户不会在支付后直接重定向。因此，我不能保证他会打开给定的重定向页面。

ipn似乎是解决这个问题的方法，但是我不确定如何正确地实现它。

我使用了一个我发现并记录结果的例子，结果显示在下面的日志条目中。我有问题要解释结果。它是使用ipn模拟器生成的。

[2016-05-02 20:17 UTC] HTTP request of validation request:POST /cgi-bin/webscr HTTP/1.1
Host: www.sandbox.paypal.com
Accept: */*
Connection: Close
Content-Length: 943
Content-Type: application/x-www-form-urlencoded
 for IPN payload: cmd=_notify-validate&payment_type=instant&payment_date=Mon+May+02+2016+22%3A17%3A33+GMT%2B0200+%28Mitteleurop%C3%A4ische+Sommerzeit%29&payment_status=Completed&address_status=confirmed&payer_status=verified&first_name=John&last_name=Smith&payer_email=buyer%40paypalsandbox.com&payer_id=TESTBUYERID01&address_name=John+Smith&address_country=United+States&address_country_code=US&address_zip=95131&address_state=CA&address_city=San+Jose&address_street=123+any+street&business=seller%40paypalsandbox.com&receiver_email=seller%40paypalsandbox.com&receiver_id=seller%40paypalsandbox.com&residence_country=US&item_name1=something&item_number1=AK-1234&tax=2.02&mc_currency=USD&mc_fee=0.44&mc_gross=12.34&mc_gross_1=12.34&mc_handling=2.06&mc_handling1=1.67&mc_shipping=3.02&mc_shipping1=1.02&txn_type=cart&txn_id=250343399&notify_version=2.1&custom=xyz123&invoice=abc1234&test_ipn=1&verify_sign=AFcWxV21C7fd0v3bYYYRCpSSRl31AIR-7FrBuOZZqJMDr8d5DxEI9rpG
[2016-05-02 20:17 UTC] HTTP response of validation request: HTTP/1.1 200 OK
Date: Mon, 02 May 2016 20:17:42 GMT
Server: Apache
X-Frame-Options: SAMEORIGIN
Set-Cookie: c9MWDuvPtT9GIMyPc3jwol1VSlO=vKsQ6Wsa8-CKaGYKLQkEziH8epLey-sigvcn6CGIx_BbN7f2lkSe4OGhXkrOoD98VscO4s-IeGzIJCQSjGbkN5Zy8ggokZMUzKgmU3DXPZQ12IS1gqWwws-ZbEZwuGYp75eS0cS94sdZ7NduMDdd-wj9neb47z6x3sZOBs76MeZAu3aVS0hQFhfLWtTs5kGfVtFWpDMlA-h6xzEk1jTOteInNMwwvIKfcctwTP0lq7HdBsSpBOxgGkj5aGqanty9RiMlioT_7_3I93WK2S1pTJuN5HIIuS4Ci3HuXUkgin6ian6oEhLnCPodUjWa_VIVmAUkxmVcrb1AOxLDa0lBYfV5b7vnHTHWkxtct-r7YQKX6un7_RyfeOrlSODOK-1FPcaQl6R5W7bQEuvm98K4kECj_EkvIFeUcjZWQ7wUx5Lc-Sja3yZDfFrWSvS; domain=.paypal.com; path=/; Secure; HttpOnly
Set-Cookie: cookie_check=yes; expires=Thu, 30-Apr-2026 20:17:42 GMT; domain=.paypal.com; path=/; Secure; HttpOnly
Set-Cookie: navcmd=_notify-validate; domain=.paypal.com; path=/; Secure; HttpOnly
Set-Cookie: navlns=0.0; expires=Wed, 02-May-2018 20:17:42 GMT; domain=.paypal.com; path=/; Secure; HttpOnly
Set-Cookie: Apache=10.72.108.11.1462220262202022; path=/; expires=Wed, 25-Apr-46 20:17:42 GMT
Vary: Accept-Encoding,User-Agent
Connection: close
HTTP_X_PP_AZ_LOCATOR: sandbox.slc
Paypal-Debug-Id: ed99d0b22cb7d
Set-Cookie: X-PP-SILOVER=name%3DSANDBOX3.WEB.1%26silo_version%3D1880%26app%3Dappdispatcher%26TIME%3D3870631767%26HTTP_X_PP_AZ_LOCATOR%3Dsandbox.slc; Expires=Mon, 02 May 2016 20:47:42 GMT; domain=.paypal.com; path=/; Secure; HttpOnly
Set-Cookie: X-PP-SILOVER=; Expires=Thu, 01 Jan 1970 00:00:01 GMT
Strict-Transport-Security: max-age=14400
Transfer-Encoding: chunked
Content-Type: text/html; charset=UTF-8
INVALID
[2016-05-02 20:17 UTC] Invalid IPN: cmd=_notify-validate&payment_type=instant&payment_date=Mon+May+02+2016+22%3A17%3A33+GMT%2B0200+%28Mitteleurop%C3%A4ische+Sommerzeit%29&payment_status=Completed&address_status=confirmed&payer_status=verified&first_name=John&last_name=Smith&payer_email=buyer%40paypalsandbox.com&payer_id=TESTBUYERID01&address_name=John+Smith&address_country=United+States&address_country_code=US&address_zip=95131&address_state=CA&address_city=San+Jose&address_street=123+any+street&business=seller%40paypalsandbox.com&receiver_email=seller%40paypalsandbox.com&receiver_id=seller%40paypalsandbox.com&residence_country=US&item_name1=something&item_number1=AK-1234&tax=2.02&mc_currency=USD&mc_fee=0.44&mc_gross=12.34&mc_gross_1=12.34&mc_handling=2.06&mc_handling1=1.67&mc_shipping=3.02&mc_shipping1=1.02&txn_type=cart&txn_id=250343399&notify_version=2.1&custom=xyz123&invoice=abc1234&test_ipn=1&verify_sign=AFcWxV21C7fd0v3bYYYRCpSSRl31AIR-7FrBuOZZqJMDr8d5DxEI9rpG