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我需要一些与PAYPAL IPN系统有关的帮助。我完全失去了。PayPal沙盒返回无效 - IPN验证
我建立这种形式
<form class="checkout-form" name="checkout-form" action="https://www.sandbox.paypal.com/cgi-bin/webscr" method="POST"><ul class="notices-box"></ul><div class="row"><div class="col-md-8"><h2>Order Details</h2><div class="setting"><div class="setting-label"></div><input type="text" name="first_name" placeholder="First Name..."/></div><div class="setting"><div class="setting-label"></div><input type="text" name="last_name" placeholder="Last Name..."/></div><div class="setting"><div class="setting-label"></div><input type="text" name="user_address" placeholder="Address..."/></div><div class="setting"><div class="setting-label"></div><input type="text" name="user_country" placeholder="Country..."/></div><div class="setting"><div class="setting-label"></div><input type="text" name="user_telephone" placeholder="Telephone..."/></div><div><input type="hidden" name="action" value="checkout"/>
<button name="submit" class="button-primary button-primary-for-checkout" style="width: auto; ">Place Order</button>
</div></div><!--end .part1.1-->
<INPUT TYPE="hidden" name="cmd" value="_notify-validate">
<INPUT TYPE="hidden" NAME="return" value="http://zoomthe.me/paypalipn/paypal_ipn.php"><INPUT TYPE="hidden" NAME="currency_code" value="USD">
<input type="hidden" name="amount" value="0">
<input type="hidden" name="email" value="[email protected]">
<input type="hidden" name="business" value="[email protected]">
<input type="hidden" name="item_name" value="hat">
<input type="hidden" name="item_number" value="15">
</form>
这里 - http://zoomthe.me/soundportal//index.php?page=checkout
但accesing贝宝网站时,我得到一个大的无效:(
我应该怎么做