Many companies and individuals are now happy to receive invoices through email however many very small businesses and sole traders are not equipped to do this. It is very easy to do a trial to see if it works for you. Go to https://www.zoho.com/uk/invoice/
and set up a free account. Customise your invoice template and you are ready to go. You can accept credit cards at very low cost (1.4% currently) and provide a link in the email to pay the invoice with www.stripe.com
. No set up fees required here either.