Compatibility with Magestore Onestepcheckout

To make EU VAT Enhanced compatible and fully working with Magestore Onestepcheckout, there are some actions to be done necessarily. Please follow these steps:

1. Change the field IDs of the VAT number inputs at checkout

Use app/design/frontend/base/default/template/onestepcheckout/onestepcheckout/billing.phtml and copy it to your design folder in the matching folder. Change the copied file and add an elseif-case within the field loop, on any position:

<?php elseif($helper->getFieldEnable($i)=='taxvat'): ?>
    <label for="billing:vat_id"><?php echo $this->__('Tax/VAT number') ?></label><br/>
    <input type="text" name="billing[vat_id]" id="billing:vat_id" value="" title="<?php echo $this->__('Tax/VAT number') ?>" class="input-text">

Do the same with the shipping address template app/design/frontend/base/default/template/onestepcheckout/onestepcheckout/shipping.phtml - the code should look like this:

<?php elseif($helper->getFieldEnable($i)=='taxvat'): ?>
    <label for="shipping:vat_id"><?php echo $this->__('Tax/VAT number') ?></label><br/>
    <input type="text" name="shipping[vat_id]" id="shipping:vat_id" value="" title="<?php echo $this->__('Tax/VAT number') ?>" class="input-text">

2. Edit the file app/code/local/Magestore/Onestepcheckout/controllers/IndexController.php and add the VAT-ID to the quote. Search for "customize for load country ma khong dien day du thong tin" and below the regular code, add this code:

if(isset($shipping_address_data['vat_id'])) {
    $billingVatId = $shipping_address_data['vat_id'];
}

The next code is where the field data is set to the quote address. Add the VAT-ID so that the code looks like this:

$this->getOnepage()->getQuote()->getShippingAddress()
    ->setCountryId($billingCountryId)
    ->setRegionId($billingRegionId)
    ->setPostcode($billingZipcode)
    ->setRegion($billingRegion)
    ->setCity($billingCity)
    ->setVatId($billingVatId)
    ->setCollectShippingRates(true);