Hello melboo,
Thanks for reaching out to the PayPal Community with your feedback and issue.
I'd recommend just being as clear as possible on your Facebook page. With customers, communication is key.
Here is a link with a video which outlines the PayPal invoice process: https://www.youtube.com/watch?v=wSpHvEpNCM0&feature=youtu.be
Here is another link to our Business Resource Center with additional advice about invoices and what to include to better serve your customers: https://www.paypal.com/us/brc/article/sales-invoice-template
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