Expresso Store - Edit "Vendor TX Code" sent to Sage Pay

Question

My client has very exacting demands on how the Vendor TX Code supplied to Sage Pay during checkout is formatted.

Is it possible to change this information?

Thanks in advance for any advice.

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Thanks to Ian and Adrian I figured this out - my solution follows:

I duplicated the file Merchant_sagepay_direct.php renaming the class to reflect the new gateway.

In the _build_authorize_or_purchase method I added the line

$request['VendorTxCode'] = "ClientSpecificTag_" . substr($request['Description'],strpos($request['Description'], "#") + 1) . "_" . $this->param('transaction_id');

This structures the TXcode as per the clients requirement eg: ClientSpecificTag_OrderNumber_Transaction_ID (order number is stripped from the description).

In order to allow refunds to work I had to add a new method:

I also added a new method

protected function _build_refund()
    {
        $this->require_params('reference');
        $reference = $this->_decode_reference($this->param('reference'));

        $request = parent::_build_refund();

        $request['RelatedVendorTxCode'] = "ClientSpecificTag_" . substr($request['Description'],strpos($request['Description'], "#") + 1) . "_" . $reference->VendorTxCode;

        return $request;
    }

Which ensures refund requests send the correct TX Code.

All tested and working fine.

Answer 1

Unfortunately this doesn't look to be possible from the Store interface. In the gateway itself it is pulling in the transaction ID and using that as the vendor TX code.

Gateways are designed to be plug and play however so there's no reason why you couldn't duplicate the existing gateway and then set the vendor TX code to be something specific other than transaction ID:

$request['VendorTxCode'] = $this->param('transaction_id');

Answer 2

Ian is exactly right. You can either edit the gateway directly, or you could create your own gateway class which extends the existing one and overwrites the VendorTxCode which is sent to Sage Pay.

This isn't something which I've heard of anyone doing before, normally the VendorTxCode is the same as Store's payment_id which makes them easy to match up should you need to.

You shouldn't need to worry about refunds. Whatever you set the VendorTxCode to, Store will keep a record of that and sent it back to Sage Pay when necessary. Do a test to make sure, but I don't expect you will run into any issues here.