Hjdcti

I am using the SCP extension so that prices are taken from the simple product and not the configurable.
I am using url approach to add product in the cart

checkout/cart/add?product=10940&qty=1&super_attribute[134]=22

This url adds product into cart but price is taken from first associated product only. same price is rendered in all associated products.

Can you try below code ?

$_product = $this->getProduct();
$parentIds = Mage::getResourceSingleton('catalog/product_type_configurable')->getParentIdsByChild($_product->getId());
// check if something is returned
if (!empty(array_filter($parentIds))) 
 $pid = $parentIds[0];

 // Collect options applicable to the configurable product
 $configurableProduct = Mage::getModel('catalog/product')->load($pid);
 $productAttributeOptions = $configurableProduct->getTypeInstance(true)->getConfigurableAttributesAsArray($configurableProduct);
 $options = array();

 foreach ($productAttributeOptions as $productAttribute) 
 $allValues = array_column($productAttribute['values'], 'value_index');
 $currentProductValue = $_product->getData($productAttribute['attribute_code']);
 if (in_array($currentProductValue, $allValues)) 
 $options[$productAttribute['attribute_id']] = $currentProductValue;
 
 

 // Get cart instance
 $cart = Mage::getSingleton('checkout/cart'); 
 $cart->init();
 // Add a product with custom options
 $params = array(
 'product' => $configurableProduct->getId(),
 'qty' => 1,
 'super_attribute' => $options
 );
 $request = new Varien_Object();
 $request->setData($params);
 $cart->addProduct($configurableProduct, $request);
 $session = Mage::getSingleton('customer/session');
 $session->setCartWasUpdated(true);
 $cart->save();

Main thing about adding configurable product to cart is what data/options are passed to super_attribute.

For more information please check this out.

Hope this helps.

I had the same challenge. To solve this I created a custom controller which I could call via a URL then placed Vicky Dev's code in the action that I was calling from the URL. It worked for me.