在按钮上更改Paypal电子邮件

I'm selling a certain product on my page. I got a button ID that holds all the information of the sale (Paypal account to transfer the money to, price, return URL, etc) and I use this button to get my money from people.

What I want is to be able to make it so that every purchase through this page goes to a friend's Paypal account. now, I can ask him to make a button and give me the button ID, but then I wont be able to control the price and return URL and such data (he might change them on his own).

I'm looking for a solution where I can just change the Paypal email account of the receiver on my page and viola.

Is there such thing? (In the safest way possible of course)
Thanks

So open up your button code in a text-editor and change the value here and viola

<input name="business" type="hidden" value="change this to the email">

Note ** You will find a full list of the html variables and their details for the paypal standard buttons

@https://developer.paypal.com/docs/classic/paypal-payments-standard/integration-guide/formbasics/