Paypal have CUSTOM param in its API… I want multi-dimension array pass in CUSTOM field…
<form id="paypal_form" action="https://sandbox.paypal.com/cgi-bin/webscr" method="post">
<!-- Identify your business so that you can collect the payments. -->
<input type="hidden" name="business" value="user@paypal.com">
<!-- Specify a Buy Now button. -->
<input type="hidden" name="cmd" value="_xclick">
<!-- Specify details about the item that buyers will purchase. -->
<input type="hidden" name="item_name" value="Hot Sauce-12 oz. Bottle">
<input type="hidden" name="amount" value="10">
<input type="hidden" name="currency_code" value="USD">
<!-- Prompt buyers to enter their desired quantities. -->
<input type="hidden" name="quantity" value="1">
<input type="hidden" name="notify_url" value="http://www.myurl.com" />
<!-- Display the payment button. -->
<input type="image" name="submit" border="0" src="https://www.paypal.com/en_US/i/btn/btn_buynow_LG.gif" alt="PayPal - The safer, easier way to pay online" />
<input type="hidden" value="1" name="custom[]" />
<input type="hidden" value="11" name="custom[]" />
</form>
its working fine with single custom field but multi custom field is not working…
you should pass all values like 1,2,3,4,5,6….
return url you will get custom string and convert it to array of string