Alternative to Miva Merchant?

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We have an ecommerce site with around 80 products. We are running Miva
Merchant 4.20 along with Worldpay to process orders.

The plus side of Miva is:
Lost of 3rd party modules available.

The negative side of Miva and the reason we are looking at alternetives:
We regularly get "call back errors" where WorldPay fails to notify Miva that
it has successfully accepted a credit card payment so Miva assumes the Order
was not placed and and dumps the basket contents. As a result we have to
phone the customer to ask them what products they ordered!!

Can anyone, from experience, recommend an alternative solution to the
unreliable Miva/Worldpay combination?

We need an ecommerce product that will integrate with Google pay per click
and overture so we can easily report on how pay per click adverts are



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