I just follow as directed by Fabien and i get paypal working. But I want to integrate SagePay Form Payment Module which is like basic paypal integration. There is an option also to add payment processor.

But as it requires SuccessURL and FailureURL parameter to pass along with other details I get stuck. I checked in paypal but it is not there but it should be. But paypal is working fine.

You will find following code on #id=1&view_type=form&model=portal.payment.acquirer&action=166

(change to your IP)

% if object.company_id.paypal_account:
<form action="paypalurl" method="post" target="_blank">
<input type="hidden" name="cmd" value="_xclick"/>
<input type="hidden" name="business" value="${object.company_id.paypal_account}"/>
<input type="hidden" name="item_name" value="${object.company_id.name} ${kind.title()} ${reference}"/>
<input type="hidden" name="amount" value="${amount}"/>
<input type="hidden" name="currency_code" value="${currency.name}"/>
<input type="image" name="submit" src="logourl"/>
</form>
% endif

======================== So I think it is somewhere in python code for success and failure URL. or if not in python code what will be the success and failure URLs.

Can this feature be used to also pay with other methods like for example credit cards?? or it just works with specific type of payment methods??