To make a login page for USAePay on your website you need to create a form with username and password inputs and build an html page around it. The form should send inputs as an action to http://www.usaepay.com/login
The following html code may be pasted into your website to allow customers to log in directly to the gateway:
<form method="POST" action="https://www.usaepay.com/login"> <input type="hidden" name="login" value="1"> <input type="hidden" name="resid" value="714"> <table border="0"> <tr><td><strong>Username:</strong></td> <td><input type="text" size="20" name="username"></td></tr> <tr><td><strong>Password:</strong></td> <td><input type="password" size="20" name="password"></td></tr> <tr><td colspan=2 align="center"><input type="submit" name="s" value="Login"></td></tr> </table> </form>