Modules in osCommerce – making them interactive

By | June 21, 2008

Sometimes you might want to show a Payment or Shipping Module based on other factors. A few examples;

  • Only show Paypal payment method if USPS shipping is chosen.
  • Only show Flat Rate Shipping if number of items in cart is less than three
  • Only show USPS if the total purchase value exceeds $500

I’m sure you get the idea. So, all you need to do is put in an “if” statement, and if the “if” statement is true (or false) – depends upon what you need – turn the shipping or payment module on or off appropriately.

Let’s look at Only show Flat Rate Shipping if purchase value is $200 or more

We know that Flat Rate Shipping is controlled by the shipping module:
/includes/modules/shipping/flat.php so open this ready for a code addition.

Looking at this file, we can plainly see that we can stop the module from working by using this code:

[php]$this->enabled = false;[/php]

And we can get the value of the purchase via this code:


So, putting those together, we need to do this:

[php]if($cart->total < 200) $this->enabled = false;[/php]

IF purchase value is $200 or less, don’t give a shipping quote! Easy as 123. Add that line of code right underneath:

[php]$this->enabled = ((MODULE_SHIPPING_FLAT_STATUS == ‘True’) ? true : false);[/php]

We need to make one more change. We need to access the cart on a global level, so change this line of code (approx line 18):

[php]global $order;[/php]

to this:

[php]global $order, $cart;[/php]

Now go to your Admin section and activate the Flat Rate module. It will only give a quote if the customer has $200 or more in their cart.

5 thoughts on “Modules in osCommerce – making them interactive

  1. Adam

    This is great, I’ve got it working a treat! Although, I need it to also work for weight instead of cost. I’ve tried a few variations of your code but a helping hand would be nice!


  2. Eddy

    Hope it is not a problem to bring up this old thread – but could I use

    ($order->info[‘subtotal’]) instead of ($cart->total) ?

    Thanks, Eddy

  3. Gary Post author

    Hi Eddy

    Sure, that would work fine.

  4. Bill Dyer


    I’m a novice but can handle the simple tasks with no problem. I tried this on the Regions shipping module with no sucess.

    Any help would be greatly appreciated.



  5. Gary Post author

    Bill, you need to state exactly what it is that you are trying to achieve…

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