You can connect your Mercury account to PayPal to transfer funds back and forth.
To do this, follow PayPal’s step-by-step instructions on how to link a bank account.
PayPal may ask for an eTeller ID, which Mercury accounts don't have. Instead, you should be able to connect your accounts using the “two small deposits” method of verification.
These deposits take between 1-3 business days to reflect in your Mercury account, so it may take a little longer to complete the connection using this method.