Greenzap is a scam. google greenzap scam and you find litterly hundreds of listings. They have hundreds of complaints with the BBB and all unsolved.
The owner was invoived in a scam business before starting greenzap.
I have found this service obopay to be good. easy to sign up and send money. I think its only for the US right now.
I hate xoom. They blocked 3 payments and then i call them and they say oh well we are sorry about that we could not verify you so we had to block the payment. There have been several problems with others using this service such as xoom keeping the money for 60 days or more without releasing it to either party and others.
I have signed up with moneybookers.com but have not used them yet.
I am looking for something other then google (which offers no support if something goes wrong you just have to email since there is no phone and hope you get an answer soon.) They also take no care in helping you if you get scammed you just have to call your bank.
Paypal is no friend to online buyers.
In fact, the company's terms of service even states "(PayPal) does not ensure the quality, safety, or legality of the merchandise received, nor that the seller will even ship the merchandise."
Paypal does not care about the customer or the business. They only care about themselves. So i only use them for ebay since most merchants on ebay dont take anything else.
I have looked into 2checkout.com but you must integrate it into your site. i cant see that you can send requests to people or anything.
<div style="font-size: 8pt; color: #5A5A5A; text-align: center"><a href="https://tools.obopay.com/buttons/m7EI5Y_ao_10"><img alt="Sign up and get $10" border="0" src="https://tools.obopay.com/buttons/paynow/image/pay_me_button_large_affiliate_10.png" /></a></div>