Tour Guide payment methods

Tour Guides need to ensure a fast, easy and low cost metod of getting paid.
The best option for many local private tour guides in our explorer is payment via cash. Cash on delivery when the local guide meets the client is the best way and lowest cost way to get paid.

But in what currency is preferred?
Is paypal a safer method rather than the tour guide carrying cash?

let ourexplorer.com know your thoughts today......