Nick here from Shopify. Great question!
I spoke to someone from the Capital team who said they sometimes use PayPal to collect outstanding amounts, but they'd really need to take a closer look into your account (and speak to the Account Owner (AO)) to be sure.
Your best bet here is to reach out to the support team directly in this instance. While we’re not able to provide account-specific support via the Shopify Community at this time, we’d be happy to continue assisting you through live chat, email, or callback. Please visit our support team here and log in to your account to create a support request.