當支付模式爲快速支付（按鈕）時，IPN 和PDT都會起作用， 當以Rest Api方式創建支付時， PDT是無效的，它應該是針對網站的，IPN依然起作用。調用Rest Api 付款的步驟是這樣的：
1. 註冊paypal賬號， 升級爲高級或者企業賬號;
2. 登錄開發者中心後臺，註冊app;
3. 獲取Client ID, Secret;
4. 設置ipn通知地址（profile裏面設置）;
5. 獲取paypal SDK， 在sandbox環境測試, 支付返回的url是在調用代碼裏面設置的；
POST /v1/payments/payment
POST /v1/payments/payment/<Payment-Id>/execute
主要是這兩個APi
6. 替換代碼sandbox爲正式url,上線。
需要注意的問題：
1.如果賣家退款， 資金會立刻結算，並向paypal支付一定的手續費，程序會收到ipn通知；
2.如果買家提出爭議，爭議類型是未經授權的交易時，資金會立刻凍結，程序會收到ipn通知；
3.如果買家提出爭議，爭議類型不是未經授權的交易時，資金會立刻凍結，程序不會收到ipn通知；
4. 買家和賣家的唯一交易號是完全不一致的;
5.買家和賣家的發票號（賬單號）是一致的;
6.支付返回的url所在的程序，收到的數據不可信， 可以把一切本地的邏輯放在處理ipn的程序裏面進行。ipn消息不是實時的，差不多秒級的延遲。
用戶支付完成時，返回的url會收到如下請求數據：
'success' => 'true',
'paymentId' => 'PAY-1BV5911839643144YKSCUA7Q',
'token' => 'EC-8684120785130974D',
'PayerID' => 'JARYJK2TES6C6',
調用execute接口返回：
{
"id": "PAY-1BV5911839643144YKSCUA7Q",
"create_time": "2014-12-08T06:09:02Z",
"update_time": "2014-12-08T06:10:51Z",
"state": "approved",
"intent": "sale",
"payer": {
"payment_method": "paypal",
"payer_info": {
"email": "[email protected]",
"first_name": "Test",
"last_name": "Buyer",
"payer_id": "JARYJK2TES6C6",
"shipping_address": {
"line1": "NO 1 Nan Jin Road",
"city": "Shanghai",
"state": "Shanghai",
"postal_code": "200000",
"country_code": "CN",
"recipient_name": "Buyer Test"
}
}
},
"transactions": [
{
"amount": {
"total": "20.00",
"currency": "USD",
"details": {
"subtotal": "17.50",
"tax": "1.30",
"shipping": "1.20"
}
},
"description": "Payment description",
"item_list": {
"items": [
{
"name": "Ground Coffee 40 oz",
"price": "7.50",
"currency": "USD",
"quantity": "1"
},
{
"name": "Granola bars",
"price": "2.00",
"currency": "USD",
"quantity": "5"
}
],
"shipping_address": {
"recipient_name": "Buyer Test",
"line1": "NO 1 Nan Jin Road",
"city": "Shanghai",
"state": "Shanghai",
"postal_code": "200000",
"country_code": "CN"
}
},
"related_resources": [
{
"sale": {
"id": "74V52932AB811673C",
"create_time": "2014-12-08T06:09:02Z",
"update_time": "2014-12-08T06:10:51Z",
"amount": {
"total": "20.00",
"currency": "USD"
},
"payment_mode": "INSTANT_TRANSFER",
"state": "completed",
"protection_eligibility": "ELIGIBLE",
"protection_eligibility_type": "ITEM_NOT_RECEIVED_ELIGIBLE,UNAUTHORIZED_PAYMENT_ELIGIBLE",
"parent_payment": "PAY-1BV5911839643144YKSCUA7Q",
"links": [
{
"href": "https://api.sandbox.paypal.com/v1/payments/sale/74V52932AB811673C",
"rel": "self",
"method": "GET"
},
{
"href": "https://api.sandbox.paypal.com/v1/payments/sale/74V52932AB811673C/refund",
"rel": "refund",
"method": "POST"
},
{
"href": "https://api.sandbox.paypal.com/v1/payments/payment/PAY-1BV5911839643144YKSCUA7Q",
"rel": "parent_payment",
"method": "GET"
}
]
}
}
]
}
],
"links": [
{
"href": "https://api.sandbox.paypal.com/v1/payments/payment/PAY-1BV5911839643144YKSCUA7Q",
"rel": "self",
"method": "GET"
}
]
}同時服務器會收到ipn消息， 類似：
array (
'act' => 'ipn',
'mc_gross' => '20.00',
'invoice' => '548531d624f59',
'protection_eligibility' => 'Eligible',
'address_status' => 'unconfirmed',
'item_number1' => '',
'tax' => '1.30',
'item_number2' => '',
'payer_id' => 'JARYJK2TES6C6',
'address_street' => 'NO 1 Nan Jin Road',
'payment_date' => '21:04:35 Dec 07, 2014 PST',
'payment_status' => 'Completed',
'charset' => 'gb2312',
'address_zip' => '200000',
'mc_shipping' => '1.20',
'mc_handling' => '0.00',
'first_name' => 'Test',
'mc_fee' => '0.98',
'address_country_code' => 'CN',
'address_name' => 'Buyer Test',
'notify_version' => '3.8',
'custom' => '',
'payer_status' => 'unverified',
'address_country' => 'China',
'num_cart_items' => '2',
'mc_handling1' => '0.00',
'mc_handling2' => '0.00',
'address_city' => 'Shanghai',
'verify_sign' => 'AomRS5l2W2xlt2An.GaSrAzpCl-NACIvh3Pz0HtrSBZzfcIeqDPGrXSk',
'payer_email' => '[email protected]',
'mc_shipping1' => '0.00',
'mc_shipping2' => '0.00',
'tax1' => '0.00',
'tax2' => '0.00',
'txn_id' => '5CS19517SJ894934R',
'payment_type' => 'instant',
'last_name' => 'Buyer',
'address_state' => 'Shanghai',
'item_name1' => 'Ground Coffee 40 oz',
'receiver_email' => '[email protected]',
'item_name2' => 'Granola bars',
'payment_fee' => '0.98',
'quantity1' => '1',
'quantity2' => '5',
'receiver_id' => '937CP9PSMDS2A',
'txn_type' => 'cart',
'mc_gross_1' => '7.50',
'mc_currency' => 'USD',
'mc_gross_2' => '10.00',
'residence_country' => 'CN',
'test_ipn' => '1',
'transaction_subject' => '',
'payment_gross' => '20.00',
'ipn_track_id' => 'a9059421a1dd7',
)
2014-12-08 13:04:35
賣家退款收到的ipn：
array (
'act' => 'ipn',
'mc_gross' => '-55.90',
'protection_eligibility' => 'Eligible',
'payer_id' => 'JARYJK2TES6C6',
'address_street' => 'NO 1 Nan Jin Road',
'payment_date' => '18:17:29 Dec 07, 2014 PST',
'payment_status' => 'Refunded',
'charset' => 'gb2312',
'address_zip' => '200000',
'first_name' => 'Test',
'mc_fee' => '-1.90',
'address_country_code' => 'CN',
'address_name' => 'Buyer Test',
'notify_version' => '3.8',
'reason_code' => 'refund',
'custom' => '',
'business' => '[email protected]',
'address_country' => 'China',
'address_city' => 'Shanghai',
'verify_sign' => 'AIkKNboJiyuxWLOHUlzTd3lpqCSxA1j2G80g.Gf68usTx7dykHwVOx4g',
'payer_email' => '[email protected]',
'parent_txn_id' => '78V79646KB938951Y',
'txn_id' => '03C86087BS569332H',
'payment_type' => 'instant',
'btn_id' => '3042078',
'last_name' => 'Buyer',
'address_state' => 'Shanghai',
'receiver_email' => '[email protected]',
'payment_fee' => '-1.90',
'shipping_discount' => '0.00',
'receiver_id' => '2XP27KEMUVN8A',
'insurance_amount' => '0.00',
'item_name' => 'sandbox_item111',
'discount' => '0.00',
'mc_currency' => 'USD',
'item_number' => '',
'residence_country' => 'CN',
'test_ipn' => '1',
'handling_amount' => '0.00',
'shipping_method' => 'Default',
'transaction_subject' => '',
'payment_gross' => '-55.90',
'shipping' => '10.00',
'ipn_track_id' => '2d16876d72c70',
)
2014-12-08 10:17:27資金凍結時候收到的ipn：
array (
'act' => 'ipn',
'mc_gross' => '-19.02',
'invoice' => '548541570184f',
'protection_eligibility' => 'Eligible',
'item_number1' => '',
'item_number2' => '',
'payer_id' => 'JARYJK2TES6C6',
'address_street' => 'NO 1 Nan Jin Road',
'payment_date' => '22:23:36 Dec 07, 2014 PST',
'payment_status' => 'Reversed',
'charset' => 'gb2312',
'address_zip' => '200000',
'mc_shipping' => '1.20',
'mc_handling' => '0.00',
'first_name' => 'Test',
'mc_fee' => '-0.98',
'address_country_code' => 'CN',
'address_name' => 'Buyer Test',
'notify_version' => '3.8',
'reason_code' => 'unauthorized_claim',
'custom' => '',
'address_country' => 'China',
'mc_handling1' => '0.00',
'mc_handling2' => '0.00',
'address_city' => 'Shanghai',
'verify_sign' => 'A.7n6Acd75CB8FdbeZyRGF.BoVPlArI2BzuxGNUFbCI-qvgcHJe4LgLp',
'payer_email' => '[email protected]',
'mc_shipping1' => '0.00',
'mc_shipping2' => '0.00',
'tax1' => '0.00',
'tax2' => '0.00',
'parent_txn_id' => '74V52932AB811673C',
'memo' => '14.13',
'txn_id' => '2Y80904055783821A',
'payment_type' => 'instant',
'last_name' => 'Buyer',
'address_state' => 'Shanghai',
'item_name1' => 'Ground Coffee 40 oz',
'receiver_email' => '[email protected]',
'item_name2' => 'Granola bars',
'payment_fee' => '-0.98',
'quantity1' => '1',
'quantity2' => '5',
'receiver_id' => '937CP9PSMDS2A',
'mc_gross_1' => '7.50',
'mc_currency' => 'USD',
'mc_gross_2' => '10.00',
'residence_country' => 'CN',
'test_ipn' => '1',
'transaction_subject' => '',
'payment_gross' => '-19.02',
'ipn_track_id' => '5df4cee26f6d3',
)
2014-12-08 14:23:33
