I have a form and a custom PayPal button, but how do I pass the value/price variable to PayPal?
Here is one that allows the user to enter a price and reference.
NOTE: You'll need to change business from shop@ekerner.com to your PayPal email address, but its fine by me if you don't because it just means that I will receive your payments.
You may also like to change currency_code and lc to suit your locale ...