Magento – Set up multiple Auto Return Urls for Paypal – one for each store view

The action for this form is set in the file Mage_Paypal_Block_Standard_Redirect::_toHtml. Here the form is created and the action is added via the following snippet:

$form->setAction($standard->getConfig()->getPaypalUrl())
    ->setId('paypal_standard_checkout')
    ->setName('paypal_standard_checkout')
    ->setMethod('POST')
    ->setUseContainer(true);

The function for getting the path to paypal will simply perform a sprintf and replace some items based on if you are using the sandbox or if you are passing in parameters.

public function getPaypalUrl(array $params = array())
{
    return sprintf('https://www.%spaypal.com/webscr%s',
        $this->sandboxFlag ? 'sandbox.' : '',
        $params ? '?' . http_build_query($params) : ''
    );
}

It appears that in newer versions of Magento this url has been changed, in Mage 1.9 the functions looks as follows.

public function getPaypalUrl(array $params = array())
{
    return sprintf('https://www.%spaypal.com/cgi-bin/webscr%s',
        $this->sandboxFlag ? 'sandbox.' : '',
        $params ? '?' . http_build_query($params) : ''
    );
}

What I would do firstly is try updating your system to use the url https://www.%spaypal.com/cgi-bin/webscr%s to see if that works.

You can do it from this template file :

/app/design/frontend/base/default/template/paypal/payment/mark.phtml

Both paypal logo and text "What is Paypal" is coded in this file.

Ideally you should copy this file with same path in your theme and modify this file according to requirements.

Like if your theme is :

/app/design/frontend/default/mytheme

Then in its template folder create same path as "paypal/payment" and put modified mark.phtml here(If the path and file is already here you can directly modify it).