My take on this is that you can do a group request using the "Request Money" feature, but if you want to use the invoice feature, you can send only one at a time. The invoice feature generates more detail, as I gather from reading PayPal info. I accidentally used the "Request Money" feature early on, and I might use it more now that I see how labor-intensive the invoice process is. I have about 220 contacts in my Address Book, and just clicking through pages to the end of the list (7 or 8 clicks) takes a lot of time when I want to send reminders to a bunch of them. PayPal needs to let you click to a certain page, and click to the end, not just click "next" page.
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