Paypal do a buy now button with their Merchant services but you can only take a fixed amount which you have to specify when signing up with it.
What I want to do in my code is avoid signing up to a full on Merchant like Commidea and calling their webservices, but instead have the same kind of button but where I can pass the value that I want to charge to them. For example if I want to take a payment of £20.47 exactly after someone has chosen products on my website, is it possible to pass this to Paypal with a simple button, it redirect to a page which takes the customers details and then redirect back with a payment reference?
I know Paypal fees are a lot higher than getting a dedicated Merchant but its just for a short period of time.