How to link PayPal payment method and the PayPal bank account

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Hi there, the customers of my company pay to its PayPal account, then my company transfer money from PayPal account to checking account. PayPal has been set up as a payment method on sales, and the asset account is PayPal bank account. The problem is, the PayPal payment method and the PayPal bank account are not linked. When create a new sales invoice and choose PayPal, the PayPal bank account does not come out. How to solve this problem? Thank you very much. By the way, the PayPal method is set up through Setup--Settings--Company--Credit cards--Accepted. Thanks again!