Hi rdragon,
Welcome to the community! You would only need to have one PayPal account for all three websites. You could create a PayPal button for each website and the payments would all go into the same PayPal balance.
If you wanted to be able to easily differentiate which payment is associated with each website, there are a few ways to do this.
I'm assuming that each of the websites will have a different item description which would help. Something like "Donation to Site A" or "sitea.com purchase". You could also set one of the "custom" variables in the advanced variables section under step 3 of the button creator.
Some merchants like to have a different email address on their PayPal account for each site. Then have the buttons set to send payments to the correct email address for your site.
With the options listed above, you could see which payments are which when you download your history report from the PayPal website.
Another option would be to use IPN (Instant Payment Notifications) to notify each site of a transaction and maintain your own database to keep track of the transaction data. www.paypal.com/ipn for more information
Lastly, you'll probably want to customize each button so that the PayPal checkout pages look different for each website. The variables for setting the logos and color schemes can be found here: https://www.x.com/docs/DOC-1332#id08A6HI0709B
I know this is a lot of information but I hope it gives you a good place to start. 🙂
- Frank
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