Forcing default currency at checkout

[frank18]

I recently upgraded to 1.5.4. Wanting to offer customers the opportunity to see prices in their own currency, I installed the currencies sidebox. However, I need to process transactions in AUD only.

Some customers would select a currency but that selection remained throughout the checkout process and only the invoice total was shown in AUD. This also caused problems with PayPal registering as a currency conflict.

I searched for information on how to force the default currency at checkout and found that people had asked, but never seem to have received a solution. I know that you can stop the currencies sidebox from displaying during checkout, but that doesn't help if the wrong currency is active.

My solution was to modify one file: cart/includes/init_includes/init_currencies.php

I made two insertions. First insertion near the top of the code:

if (!defined('IS_ADMIN_FLAG'))
{
  die('Illegal Access');
}

// begin insertion 1 of 2

$force_default_currency = false;
$requested_page = $_SERVER['REQUEST_URI'];
// Does requested page contain the string 'checkout'?
// If so, then force currency to default
if (strpos($requested_page, 'checkout') !== false)
{
    $force_default_currency = true;
}

// end insertion 1 

The second insertion is just before the end of the code:

// begin insertion 2 of 2

elseif ($force_default_currency)
{
    $_SESSION['currency'] = DEFAULT_CURRENCY;
  // redraw the page without the currency/language info in the URL
  if (isset($_GET['currency']) || isset($_GET['language'])) zen_redirect(zen_href_link($current_page_base, zen_get_all_get_params(array('currency','language'))));

// end insertion 2
}

?> 

This has solved my issue completely and my method may be helpful to others.

Ended up in need of your hack after installing the eWay payment module as my merchant facility only accepts order currency AUD.

Had no further issues after implementation of your code - thanks!

Frank