On the subject of adding customer details; i wouldnt bother. Personally its just more of a risk to data being hijacked.
I just leave a bill; if they are in i encourage payment by card. In 2019 i will no longer be accepting payment by cash; except the very few very elderly customers i have left.
Card is best for cashflow especially PayPal here as the funds are in your company bank account immediately.
BACS is second best because it doesnt cost anything; but only suitable for those customers who are good at paying. If i dont get thier payment within the week; i say that if they are looking for credit then i suggest a direct debit.
Direct debits are taken on the 26th day of the month for me; it saves book keepig time as its just one lump sum that comes through at the end of the month.
why will you not accept cash as payment from next year? 
ill take anything.....cash/cheque/BACS/standing order/contactless/card payments......
Its just a PITA thats why.
You do a £28 job and they give you £30; you got to carry a cash float about, or sometimes if you haven't the change keep £2 on account for the next time.
The cash you do get, well that needs to be paid into the bank which is becoming more difficult. Barclays ( in my case) have closed all the local branches bar woking town centre, where you have to park up and walk to the bank all before 4:30pm...its a joke. Even then there is a queue out the door as there is only one cashier; to then be told you can use the wall machines to pay cash in but you explain to them for the millionth time your not just paying in notes; your paying in coin aswell which the machines dont handle.. whilst they stare at you with this false helpful face...
You can pay in via post office; but everyone knows what its like queuing at one of those places whilst mrs Higgins pays for a sheet of stamps in 2p coins.
There are some reasons for u.
