I know this may be a little bit late (newbie here) but I'd issue a word of caution about customers offering to pay via BACS or direct transfer online. Please do your best to ensure that the customer is 100% genuine and here's exactly why:
We fell fowl of a huge scam a couple of years ago, one that caught out many online traders and probably still is. Unless you manage to spot the banking errors as soon as they appear, there's not a lot you can do about it. I believe sites like eBay were/possibly still are rife with these (and many other) fraudsters. Customer initiates a purchase, invoicing gets activated etc, then you receive a perfectly innocent query about paying directly into your account - alleged customer has no PayPal or whatever. (I believe you now NEED a PayPal account for eBay) As soon as you submit their invoice containing the relevant bank account name, sort code and account number they have all they need. No payment arrives. You assume non paying bidder/buyer or cancelled order and then, one day, you notice an unusual direct debit. That's the start of it. Being a 'frugaleur', I spotted mine as soon as the first debit was applied to my account, but many don't spot them (notice THEM, not 'it') until several months later. As it turned out, my account details had been set up to insure a house and contents and several brand new cars, amongst other things. Police & Bank fraud investigation units get involved, banks refund the unauthorised payments, insurance companies cancel the policies after a few checks and then the case gets dropped! Why?
Because if nobody loses any money, there can be no crime!
I had to do a fair bit of investigating for myself on this - wrote it up in published reports as I went along - but, in my opinion, it's still going on and the whole lot is being covered up by the financial institutions involved. Cybercrime - probably the biggest threat to business in the 21st Century and it appears to be subject to several cover-ups. It doesn't need a genius to see why.
Please, if anyone is accepting payments for online transactions direct to bank accounts, scrutinise your statements often and keep on doing so. It may take a week, a month or, even, a year before the fraudsters deploy their plan but they already have your details. (They can lift exact same from a cheque). I could bore you all to tears with all my findings on this extremely well orchestrated scam but won't waffle any longer. I just felt it pertinent to share my findings with you.
I did, apparently, have a second attempt made but via my credEcard account, which doesn't allow a facility for direct debits to third parties. That attempt failed. CredEcard also provides you with a barcode so anyone alleging not to have a method for paying online can simply be sent an invoice for paying cash anywhere they see the PayPoint sign.
Hope this helps make a few more people aware of this simple scam.