I understand the frustration. PayPal's site does timeout rather quickly, and yeah, if you've got 2FA enabled it can be a bit of a pain. You may want to consider our PayPal Partner solution. We built a VT/Invoicing system on the PayPal Commerce API that replicates the VT/Invoicing tools PayPal provides. Our tool does have a timeout, but it's a lot longer so you don't have to mess with this nearly as much. As a side bonus, PayPal's fees are cheaper with their API than when using the VT/Invoicing system directly, so not only will you have a better time using it, but you'll also save some money on fees. Let me know if you have any questions or concerns about that.
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