I too have been looking into this, here's a snippet from their FAQ:

I've sent a payment to the wrong mobile phone number ? what should I do next?

You must let us know immediately if you send a payment to the wrong number. If the money has been paid to someone with a Barclays current account, we will attempt to take the payment out of their account and return it to you. If the payment was to someone who holds an account with another bank, we will attempt to recall the payment.

If we are unable to recover the payment for you, for example because the payee no longer has funds in their account or refuse to return it, we may on request provide you with the payment details to enable you to contact the beneficiary bank yourself to help you recover the payment.

Please remember that you should always ensure you enter the correct details when making a payment, as we are not responsible if you send it to the wrong person. Each time you make a payment with Barclays Pingit, you will be shown a confirmation page before your payment is sent, so make sure to check these details are correct before you confirm.

I believe this means that if you have a non-Barclays account, they will attempt to reverse the payment like you can with BACS. I'm not sure on the timescales but I don't think you can hold out much hope if it's just an hour you're with him and he gets straight on the phone afterwards to cancel it. Problems might occur if he does it a lot, his bank might start asking questions re fraud.

If I was going to go down this route I would get him to send me a text from that phone with my name on it confirming services received, that way at least I would have something to go to the bank with as proof.

I guess the proof is in the pudding on this one.

Paypal could seize your funds and shut your account, plus it's reversible after the transaction.

Lots of threads on here on the topic of deposits.

I'm a suspicious bitch, I'd be worried about accepting ukash because there's no way of knowing if the voucher is used until you try to use it yourself. I tell them to either give me aw credits or direct transfer into my bank. Dont need a name, just the bank account number.

Foxy Roxy, I know from experience that although you don't need to give a name, when they go in with a/c number and sort code the bank staff often 'check' the account holder's name with them. Sooo annoying.

Yup this happened to me last week, I was read back the name of the account holder.

I will not be giving my bank details to anyone.

Hi Ladies

I'm thinking of introducing a deposit scheme to weed out any potential time wasters as much as possible.

I was originally looking at bank transfer but I realise that the clients name would show on my statement  which some may not like. Is there any other ways you accept deposits? I would prefer cash in bank rather than a voucher system but open to any ideas

I did try searching however most of the answers were over 5 years old so I don't know if the info provided is still up to date / relevant.

TIA x

I accept deposits by bank transfer, cash in branch, and also amazon voucher. Amazon vouchers can also be bought from shops, as well as online and as far as I understand all is needed is the code from the back.

3v vouchers, untraceable, not refundable and can be transfered in to your bank account for a small fee. Can be bought from any corner shop with a payphone machine

No. You create an account using an email address. You can then add the voucher to yout account. Each voucher is translated in to a virtual visa card which you can use online OR if you prefer you can transfer the funds in to your bank account. I usually just use the card but I did the transfer once and it took about 3 days. Once you have claimed the voucher to your online account no one else can use the voucher number so you need to validate it as soon as you get it x

It says that 3v visa prepaid vouchers are being discontinued. 

"Unfortunately, the 3V Visa product is being discontinued on 16th December 2015 and 3V vouchers will only be available to be purchased up to this date."

"Customers purchasing a 3V Visa voucher will continue to have 3 full months from date of purchase to redeem and spend the virtual 3V Visa number."