Prepare POST FORM

prepare_post_form.php

// Use the browser key as one the params
<form action="<?= PAYMENT_REDIRECT_URL ?>" method="post">
  <input type="hidden" name="MERCHANT_ID" value="<?= MERCHANT_ID ?>" />
  <input type="hidden" name="ORDER_ID" value="<?= $order['order_id'] ?>" />
  <input type="hidden" name="TOKEN_BROWSER" value="<?= $key['token_browser'] ?>" />
  <input id="submitBtn" type="submit" value="Confirm Checkout" />
</form>

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