Нужно сделать интеграцию с платежными сервисами 2Checkout и Paysera.

Не разбирался как формируется ссылка для оплаты в этих сервисах, но обычно вариантов несколько:

1. форма с параметрами в скрытых полях (типа номер заказа, ид мерчанта, ссылка коллбека)

2. Через апи

3. Возможность создать кастомную форму для ввода номера карты и параметров в скрытых полях

https://developers.paysera.com/ru/checkout/integrations/integration-library

https://github.com/2Checkout/2checkout-php

Пример для вариантов 1 и 2:

https://paybot.top/mc_payform_new?user_id=1868174519888391&customer=1788512094582035&order_id=1684&webview=botsheet

$fields = array(

'transactionType' => 'PURCHASE',

'merchantAccount' => $settings['way_merchant_id'],

'merchantDomainName' => $settings['way_merchant_domain'],

'amount' => $summa1,

'productName' => $pr,

'productCount' => '1',

'productPrice' => $summa1,

'merchantTransactionSecureType' => 'AUTO',

'orderReference' => $order_id,

'orderDate' => time(),

'language' => $settings['user_lang'],

"currency" => $currency,

'returnUrl' => $settings['way_result_url'].'?user_id='.$user_id.'&mes_id='.$mes_id.'&order_id='.$order_id,

'serviceUrl' => $path.'/mc_way_callback?user_id='.$user_id.'&mes_id='.$mes_id.'&order_id='.$order_id,

'clientAccountId' => $mes_id,

'clientZipCode' => $user_id,

'orderTimeout' => '1000000'

);

$sigfields = array(

'merchantAccount' => $settings['way_merchant_id'],

'merchantTransactionSecureType' => 'AUTO',

'merchantDomainName' => $settings['way_merchant_domain'],

'orderReference' => $order_id,

'amount' => $summa1,

'productName' => $pr,

'productCount' => '1',

'productPrice' => $summa1,

'orderDate' => time(),

"currency" => $currency

);

$Way = new WayForPay($settings['way_merchant_id'],$settings['way_merchant_pass'],"utf8");

$Way->createSignature('PURCHASE', $fields);

ЧЕРЕЗ ФОРМУ

/*echo '

<form method="post" action="https://secure.wayforpay.com/pay" accept-charset="utf-8">

<input type="hidden" name="merchantAccount" value="'.$settings['way_merchant_id'].'">

<input type="hidden" name="merchantTransactionSecureType" value="AUTO">

<input type="hidden" name="merchantAuthType" value="SimpleSignature">

<input type="hidden" name="merchantDomainName" value="'.$settings['way_merchant_domain'].'">

<input type="hidden" name="merchantSignature" value="'.$Way->createSignature('PURCHASE', $fields).'">

<input type="hidden" name="orderReference" value="'.$order_id.'">

<input type="hidden" name="orderDate" value="'.time().'">

<input type="hidden" name="amount" value="'.$summa1.'">

<input type="hidden" name="currency" value="'.$currency.'">

<input type="hidden" name="orderTimeout" value="490000">

<input type="hidden" name="productName" value="'.$pr.'">

<input type="hidden" name="productPrice" value="'.$summa.'">

<input type="hidden" name="productCount" value="1">

<button class="btn btn-lg btn-success" type="submit">'.$settings["pay_$settings[user_lang]"].'</button>

</form>';*/

echo '<a class="btn btn-lg btn-success" href="'.$Way->generatePurchaseUrl($fields).'">'.$settings["pay_$settings[user_lang]"].'</a>';

Пример 3-го варианта:

https://paybot.top/mc_stripe_payform?user_id=1868174519888391&customer=1788512094582035&order_id=1684&webview=botsheet

https://paybot.top/mc_auth_payform1?user_id=1868174519888391&customer=1788512094582035&order_id=1684&webview=botsheet

<form id="contact-form" method="post" action="mc_auth_charge.php" role="form" accept-charset="UTF-8">

<input type="hidden" name="order_id" value="<?=$order_id;?>" />

<input type="hidden" name="mes_id" value="<?=$mes_id;?>" />

<input type="hidden" name="user_id" value="<?=$user_id;?>" />

<input type="hidden" name="amount" value="<?=$summa;?>" />

<input type="text" class="form-control namec" placeholder="<?=$lang['name'];?>" name="name" value="<?=$name;?>">

<input type="email" class="form-control" placeholder="Email" name="email" value="<?=$email;?>">

<input type="phone" class="form-control" placeholder="Phone" name="phone" value="<?=$phone;?>">

<input type="text" class="form-control" placeholder="Address" name="addr" value="<?=$addr;?>">

<textarea rows="4" name="comm" class="form-control input-group-lg" placeholder="Comments"><?=$comm;?></textarea>

<input type="text" class="form-control" placeholder="Card number" name="number" required="Enter card number">

<input placeholder="CVC" class="form-control" type="number" name="cvc" required="Enter CVC code">

<input placeholder="MM/YY" class="form-control" type="hidden" id="expiry" name="expiry" required="Enter exparation date">

<select name="month" id="month"

class="form-control">

<option value="01">01</option>

<option value="02">02</option>

<option value="03">03</option>

<option value="04">04</option>

<option value="05">05</option>

<option value="06">06</option>

<option value="07">07</option>

<option value="08">08</option>

<option value="09">09</option>

<option value="10">10</option>

<option value="11">11</option>

<option value="12">12</option>

</select>

<select name="year" id="year"

class="form-control">

<option value="2020">2020</option>

<option value="2021">2021</option>

<option value="2022">2022</option>

<option value="2023">2023</option>

<option value="2024">2024</option>

<option value="2025">2025</option>

<option value="2026">2026</option>

<option value="2027">2027</option>

<option value="2028">2028</option>

<option value="2029">2029</option>

<option value="2030">2030</option>

</select>

<button type="submit" id="submit1" form="contact-form" class="btn btn-lg btn-success mx-auto postfix" ><?=$settings["pay_$settings[user_lang]"];?> <?=$summa1;?>$</button>

Если система позволяет - нужно реализовать все 3 варианта

ПРИМЕР КОЛЛБЕКА:

$data = base64_decode($_POST["data"]);

if ($data != "") {

    $signa = $_POST["signature"];

    $result = json_decode($data);

    $status = $result->{'status'};

    $sign = base64_encode(sha1($settings['liqpay_merchant_pass'].$data.$settings['liqpay_merchant_pass'],1));

    if(strcmp($sign, $_POST['signature']) === 0) {$signature = "ok";} else {$signature = "no";}

    if (($status == "success" && $signature == "ok"))

    {

        update_order(...);

    }

    if (($status == "error" || $status == "failure"))

    {

        update_order(...);

    }

}

нужно получать в коллбеке статусы (все варианты) + сверять подпись если нужно