Returning custom input data from PayPal - php

Question

I created a basic purchase script where a user enters their desired username and password, then they can purchase the membership on my website. But, when it goes to the return page, the values Username and Password don't show in the url. Here is the code:
<form action="https://www.paypal.com/cgi-bin/webscr" method="post">
<input type="hidden" name="cmd" value="_s-xclick">
<input type="hidden" name="hosted_button_id" value="CKQH4CYEMYLWW">
<center>
<span id="msgbox" style="display:none;"></span>
<br><br>
<input type="text" id="rusername" name="rusername" placeholder="Desired Username" class="usernamelogin">
<br><br>
<input type="password" id="rpassword" name="rpassword" placeholder="Desired Password" class="passwordlogin">
<br><br>
<input type="image" src="https://www.paypalobjects.com/en_US/GB/i/btn/btn_buynowCC_LG.gif" border="0" name="submit" alt="PayPal — The safer, easier way to pay online.">
<img alt="" border="0" src="https://www.paypalobjects.com/en_GB/i/scr/pixel.gif" width="1" height="1">
</form>

Answer 1

set cookie variable for each input variable and pass the data accordingly . . and on return from paypal you can simply check the cookie variable and pass the data in the individual input accordingly ..

Answer 2

Paypal Standard gives one variable 'custom' for passing custom data
so you can have a way to pass those values using this variable and getting back.
eg. you can seperate the values using | and get back
<input type="hidden" id="custom" name="custom" value="username|password"/>
you can set the values when your form is going to be submitted
when success page comes you can get the values
list($username,$password) = explode('|',$_POST['custom']);