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Invoice Payment
A majority of businesses today all have a PayPal account and it is prudent for businesses to have one because, a majority of people have a PayPal account that they use to make purchases with. In the user settings menu all you would need to do is add your business email account that is associated with your PayPal account and your good to receive payments directly into your business PayPal account.
Your clients can choose to either pay you via their credit / debit card or use the PayPal system or, if you have requested that your client makes a bacs transfer, then this too, should not pose a problem because, a user would have requested this in the "Notes" section of their invoice.