Код HTML:
<form method="post" name="checkpay" action="/process.xml">
<input type="hidden" id="request-id" name="request-id" value="3633383237363533365f653735386665643537643230336264663737613239663862633835393630356362353336663063375f3432343030363436">
<input type="hidden" name="tmx-requestid" value="3633383237363535385f616463323330393236323037613764326463333637326638646564643535333334613938373632645f3432343030363436">
<div class="b-form-pane b-form">
<div class="b-form-pane__content">
<table border="0" width="100%" cellspacing="0" cellpadding="0">
<tbody>
<tr>
<td>Название платежа</td>
<td colspan="2">
<b>Магаз</b>
</td>
</tr>
<tr>
<td>Сумма</td>
<td colspan="2">
<b>2</b>
*руб.*50*коп.
</td>
</tr>
<tr>
<td></td>
<td colspan="2">
<a href="javascript:void(0)" class="contract-details-link b-link_theme_grey">Детали*платежа</a>
<div id="contract" style="display:none">
Магаз
<br>
Реквизиты платежа:
<br>
Cумма платежа: 2.5 RUB
<br>
Идентификатор клиента: 105....
<br>
Номер транзакции: 200.....
<br>
Юр.лицо: ООО "И...."
<br>
Номер договора: Н....
<br>
</div>
</td>
</tr>
<tr>
<td colspan="3" class="payment-division">
<div class="division-line">
<i></i>
</div>
</td>
</tr>
<tr class="challenge" id="paytype-control">
<td class="payment-types">Способ оплаты</td>
<td colspan="2" class="paytype-control-selector">
<span class="b-form-radio b-form-radio_size_m b-form-radio_theme_grey i-bem b-form-radio_js_inited" onclick="return {'b-form-radio':{name:'b-form-radio',id:'id1166198886191'}}">
<label class="b-form-radio__button b-form-radio__button_id_ b-form-radio__button_disabled_no b-form-radio__button_focused_yes b-form-radio__button_checked_yes yamoney-account b-form-radio__button_side_left" for="id1166137776203">
<span class="b-form-radio__inner">
<span class="b-form-radio__content">
<input type="radio" name="pay-money-source" class="b-form-radio__radio" checked="" id="id1166137776203" value="yamoney-account-41001374943666">
<span class="b-form-radio__text">Яндекс.Деньгами</span>
<i class="b-form-radio__click"></i>
</span>
</span>
</label>
<label class="b-form-radio__button b-form-radio__button_id_ b-form-radio__button_disabled_no gateline-throughcard b-form-radio__button_next-for-checked_yes b-form-radio__button_side_right" for="id1166131886222">
<span class="b-form-radio__inner">
<span class="b-form-radio__content">
<input type="radio" name="pay-money-source" class="b-form-radio__radio" id="id1166131886222">
<span class="b-form-radio__text">банковской картой</span>
<i class="b-form-radio__click"></i>
</span>
</span>
</label>
</span>
<span id="hint-nocard-payment" class="ym-simple-tip-hint">Здесь еще нельзя платить с банковской карты.</span>
</td>
</tr>
<tr class="challenge" id="cvv-control" data-do-have-card="false" style="display: none;">
<td class="payment-types" colspan="1"></td>
<td colspan="2">
<div id="cvv-block-nocard" class="cvv-descr-content">
Вы еще не добавили карту в кошелек, но можете сделать это
<a href="https://sp-money.yandex.ru/card/card-payment/bind-check.xml?from=order">прямо сейчас</a>
.
</div>
</td>
</tr>
<script type="text/javascript">r(this, 'stred/pid=41/cid=71887/path=cardon');</script>
<tr class="challenge" id="challenge-control" data-block-js="b-payment-challenge" data-hide-submit-button="false" data-is-emergency-mode-started="false" data-offset-left-elem="#b-descr-and-confirm" data-challenge-type="secure-password" data-process-type="true">
<td class="payment-types" colspan="1">Платежный пароль</td>
<td class="challenge-control-content" colspan="2">
<div class="challenge-passwd-wrapper" data-block-js="b-payment-challenge-passwd" data-control-around="challenge-control" data-error="" data-offset-left-elem="#b-descr-and-confirm">
<span class="b-form-input b-form-input_theme_grey b-form-input_size_ml b-form-input_money-secure-passwd_yes i-bem b-form-input_js_inited" onclick="return {'b-form-input':{name:'b-form-input'}}">
<span class="b-form-input__box">
<label class="b-form-input__ico-secure-passwd" for="passwd"></label>
<input class="b-form-input__input" id="passwd" type="password" name="passwd" tabindex="4" autocomplete="off">
</span>
</span>
</div>
<span id="checkPassSymbols-hint" class="ym-simple-tip-hint">Недопустимые символы в пароле. Возможно, у вас включена русская раскладка клавиатуры.</span>
<span id="passwd-failed-hint" class="ym-simple-tip-hint">Вы ввели неверный пароль.</span>
<span id="passwd-empty-hint" class="ym-simple-tip-hint">Вы не ввели платежный пароль.</span>
<span id="add-sauth-error-help-hint" class="ym-simple-tip-hint"></span>
</td>
</tr>
<tr class="challenge" id="challenge-submit">
<td></td>
<td colspan="2">
<span onclick="return {'b-form-button':{name:'b-form-button'}}" tabindex="15" class="b-form-button b-form-button_theme_grey-l b-form-button_size_l i-bem b-form-button_js_inited b-form-button_disabled_no">
<i class="b-form-button__left"></i>
<span class="b-form-button__content">
<span class="b-form-button__text">*Подтвердить*</span>
</span>
<input type="submit" class="b-form-button__input" hidefocus="true" value="">
</span>
<span class="b-payment-challenge_return-link b-link_theme_light-grey"></span>
</td>
</tr>
<tr class="challenge cl-challenge-column">
<td></td>
<td></td>
<td></td>
</tr>
</tbody>
</table>
</div>
</div>
<input type="hidden" name="secureparam7" value="true">
</form>
Вот код где нужно ввести платёжный пароль и нажать подтвердить.