Try some of the tokens in Back Office > Admin > Help
e.g.
[TAG:WEBSITEURL]
[Order:PortalID]
If they don't work in the merchantlogo.template then see if they work in paymentOK.email.
e.g.
[TAG:WEBSITEURL]
[Order:PortalID]
If they don't work in the merchantlogo.template then see if they work in paymentOK.email.