Button custom amount

[landysaccount]

Hello.

I would like to add a "pay now" button to my website to allow users to pay for services but, we don't have fixed prices. I would like to create a button or code that will allow user to pay the amount of the server or have the user to enter any amount they would like to pay. How can I accomplish this.

Thanks in advanced for your time and help.

[Albertoantonio1]

Pago mi cuenta