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我可以用標準購買流量付款，但我無法驗證我的IPN監聽器。我認爲問題charset。我的PayPal IPN監聽器不驗證，而經常性訂閱
我的IPN監聽器標準流量
<form id="payPalForm" name="payPalForm" action="https://www.sandbox.paypal.com/cgi-bin/webscr" method="post">
<input type="hidden" name="rm" value="2">
<input type="hidden" name="return" value="http://turkishreview.dev/payment/bc1412c5e0c433837c93b2243406e74a223b92a1">
<input type="hidden" name="notify_url" value="http://turkishreview.dev/payment/bc1412c5e0c433837c93b2243406e74a223b92a1">
<input type="hidden" name="cmd" value="_xclick">
<input type="hidden" name="amount" value="19.00">
<input TYPE="hidden" name="charset" value="utf-8">
<input type="hidden" name="business" value="[email protected]">
<input type="hidden" name="currency_code" value="USD">
<input type="hidden" name="item_number" value="digital_6">
<input type="hidden" name="item_name"
value="12 Months - 6 Issue (Digital)">
<input type="submit" name="submit" id="payPalButton2" style="display: none;" value="submit"/>
</form>
變量，字符集通過貝寶返回UTF-8和驗證
[cmd] => _notify-validate
[mc_gross] => 19.00
[protection_eligibility] => Eligible
[address_status] => confirmed
[payer_id] => K6YW3FZC8PHSE
[tax] => 0.00
[address_street] => 1 Main Terrace
[payment_date] => 03:38:23 Jun 10, 2016 PDT
[payment_status] => Pending
[charset] => utf-8
[address_zip] => W12 4LQ
[first_name] => buyer
[address_country_code] => GB
[address_name] => buyer buyer
[notify_version] => 3.8
[custom] =>
[payer_status] => verified
[business] => [email protected]
[address_country] => United Kingdom
[address_city] => Wolverhampton
[quantity] => 1
[payer_email] => [email protected]
[verify_sign] => *****
[txn_id] => 460748311V638183B
[payment_type] => instant
[last_name] => buyer
[address_state] => West Midlands
[receiver_email] => [email protected]
[receiver_id] => 6PUKL55H4XAF6
[pending_reason] => multi_currency
[txn_type] => web_accept
[item_name] => 12 Months - 6 Issue (Digital)
[mc_currency] => USD
[item_number] => digital_6
[residence_country] => GB
[test_ipn] => 1
[handling_amount] => 0.00
[transaction_subject] =>
[payment_gross] => 19.00
[shipping] => 0.00
[auth] => ******
定期訂閱流在我的IPN
<form id="payPalForm" name="payPalForm" action="https://www.sandbox.paypal.com/cgi-bin/webscr" method="post">
<input type="hidden" name="rm" value="2">
<input type="hidden" name="return" value="http://turkishreview.dev/payment/f7fc9d64140453cd728c4ffd28267901bbf403e7">
<input type="hidden" name="notify_url" value="http://turkishreview.dev/payment/f7fc9d64140453cd728c4ffd28267901bbf403e7">
<input type="hidden" name="paymentaction" value="sale">
<input type="hidden" name="cmd" value="_xclick-subscriptions">
<input type="hidden" name="bn" value="Subscribe">
<input type="hidden" name="a3" value="19.00">
<input type="hidden" name="p3" value="1">
<input type="hidden" name="t3" value="Y">
<input type="hidden" name="src" value="1">
<input TYPE="hidden" name="charset" value="utf-8">
<input type="hidden" name="business" value="[email protected]">
<input type="hidden" name="currency_code" value="USD">
<input type="hidden" name="item_number" value="digital_6">
<input type="hidden" name="item_name"
value="12 Months - 6 Issue (Digital)">
<input type="submit" name="submit" id="payPalButton2" style="display: none;" value="submit"/>
</form>
變量聽衆，charset通過paypal 返回windows-1252，它尚未驗證
[cmd] => _notify-validate
[txn_type] => subscr_signup
[subscr_id] => I-AN3DCCNUT8B4
[last_name] => buyer
[residence_country] => GB
[mc_currency] => USD
[item_name] => 12 Months - 6 Issue (Digital)
[business] => [email protected]
[amount3] => 19.00
[recurring] => 1
[address_street] => 1 Main Terrace
[payer_status] => verified
[payer_email] => [email protected]
[address_status] => confirmed
[first_name] => buyer
[receiver_email] => [email protected]
[address_country_code] => GB
[payer_id] => K6YW3FZC8PHSE
[address_city] => Wolverhampton
[reattempt] => 1
[item_number] => digital_6
[address_state] => West Midlands
[subscr_date] => 03:48:50 Jun 10, 2016 PDT
[address_zip] => W12 4LQ
[charset] => windows-1252
[period3] => 1 Y
[address_country] => United Kingdom
[mc_amount3] => 19.00
[address_name] => buyer buyer
[auth] => *****
[form_charset] => UTF-8
我已經設置沙盒和PayPal生產我的賣家賬戶字符集UTF-8，但發生同樣的錯誤 
有什麼不對？任何想法 ？