Shirley,
There's two parts to consider to the merchant account. The first part is the payment capture, and I'd recommend [URL="http://www.sagepay.com"]www.sagepay.com[/URL] for this.
You need to connect this up to your merchant account with your bank account, I have used and can recomment Natwest's streamline product. More info on [URL="http://www.natwest.com"]www.natwest.com[/URL]
You normally pay a flat fee (about 20p) + 2-3% per transaction depending on volume and card type.
Matt Russell
MerchantAccountTalk Administrator
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