Paypal and Primary Email address

I am having a problem with my eShop paypal configuration with failed payments. I ordered an item in the shop and payed for it with an alternative paypal email account that has no relation with my eshop site and the order payment using paypal has failed. When I review the paypal account i used to pay for the order it shows successful payment and the paypal used to receive the payment shows success. But the eShop plugin shows the payment in the failed orders tab. It looked/sounded similar to this article http://wordpress.org/support/topic/eshop-order-failed-paypal-payment-succeeded-but-eshop-send-invalid-paiement

So I read the article here: http://quirm.net/wiki/eshop/setting-up-merchant-gateways/paypal/.

I then saw this statement and was a little confused. Your Primary Email Address must match the PayPal email address entered into eShop.

The paypal account is setup with an email address that is not the primary admin email address for the entire wordpress site, but it is configured with the paypal email address set as the Main Account Email Address for the paypal merchant gateway. Does this mean that this email address must also be the same as the WordPress main admin email address?

If these must be the same, this will not work as this site is for a client of mine and I am the main admin of the site and cannot give the end user full control to edit plugins and themes as they will probably mess something up. I need to be able to allow my clients email address to be the main account email address for the paypal merchant gateway, while allowing my email address to be the Primary WordPress Site Admin email address. Thanks in advance for clarifying this for me and the rest of the multitudes of eShop users.

http://wordpress.org/extend/plugins/eshop/