How to configure Receipt, ReceiptSignature parameters in Uniteller form for commit?

Question

JavaScript

Good afternoon, tell me, there is a usual form on the page through which payment for services is carried out in Uniteller. Now you need to configure fixing, for this you need to pass the parameters Receipt, ReceiptSignature. Can someone tell me how it's done. A simple form is installed, not a module, since the price is specified arbitrarily.