How can I differentiate order numbers/reports on PayPal from my second Shopify store?

[ThePrincessCut]

Hi all,

I have a PayPal integration setup for my first Shopify store. I'd like to add a second email address and start taking payments for my second store but I'd like to ask how to differentiate the invoices and reports. Will it be necessary to add a prefix/suffix to the invoice numbers on my second Shopify store or is there another way?

Best,

Nina