When you link your PayPal account, we authorise a small amount in the currency you set for your project to test your account. If all the details are correct, your future transactions will be processed without any problems. If there are issues, it will tell you the currency is not accepted.
If your details have been rejected, it means we cannot process funds into your PayPal account.
Once you've resolved this with PayPal, you will need to re-enter your PayPal email address into the project editor and choose 'Save & Continue' for the changes to take effect.