I think it would be good idea, to get a feature to be able to accept credit card payments.
For example. Being self employed we do some services for client on daily basis. Quite often they want to pay with credit card/or debit card. Sometimes these amounts are over £100 (so moznonlink not good here). Would be good to be able to send invoice with sms/WhatsApp etc and client can pay on the spot whilst with you.