I managed to navigate to realex hpp. I fill all data and the transaction seems to work ok but when it should redirect to my page it does not. It write some part of my application inside realex-hpp page.
Here is the form I'm using to navigate. The response_url is a valid url, I tried several times.
<form action="https://pay.sandbox.realexpayments.com/pay" method="POST"
id="payment-gateway" name="payment-gateway" accept-charset="UTF-8">
<input type="hidden" name="MERCHANT_ID" id="MERCHANT_ID" value=">>
<merchant_id>"/>
<input type="hidden" name="TIMESTAMP" id="TIMESTAMP" value="20170824103739"
/>
<input type="hidden" name="ACCOUNT" id="ACCOUNT" value="internet" />
<input type="hidden" name="ORDER_ID" id="ORDER_ID"
value="eRz4N2PLTMOoc8sO1nlSlA" />
<input type="hidden" name="AMOUNT" id="AMOUNT" value="12657" />
<input type="hidden" name="CURRENCY" id="CURRENCY" value="EUR" />
<input type="hidden" name="SHA1HASH" id="SHA1HASH"
value="b279a662b6f3e84173454537f94ef4fcb5174d7b" />
<input type="hidden" name="AUTO_SETTLE_FLAG" id="AUTO_SETTLE_FLAG" value="1"
/>
<input type="hidden" name="MERCHANT_RESPONSE_URL" id="MERCHANT_RESPONSE_URL"
value="<response_url>" />
Here is what I see insted the redirection.