有支付提交之前的钩子吗

<form action="/index.php?s=member&app=pay&c=pay" class="form-horizontal" method="post" name="myform" id="payform">
<input name="is_form" type="hidden" value="1">
<input name="is_admin" type="hidden" value="1">
<input name="is_tips" type="hidden" value="">
<input name="csrf_test_name" type="hidden" value="92f38063f950ca96af87dbac42ee5465">
<input type="hidden" name="pay[url]" value="" />
<input type="hidden" name="pay[mark]" value="my-paydown_buy-7149-1-shouce" />
<input type="hidden" name="pay[title]" value="" />
<input type="hidden" value="9.9" name="pay[money]">
<div class="paydown_form">
<p class="down_tips">当前下载需要支付金额
<span class="nep">￥ <i>9.90</i> 元</span>
</p>
<p class="down_tips">付款方式</p>
<span class="Radio">
<input type="radio"  id="alipay2" name="pay[type]" value="alipay2">
<label for="alipay2"><i class="fa fa-rmb"></i>支付宝</label>
</span>
<p class="btn">
<button type="submit"> 支付下载 </button>
</p>
</div>
</form>