Variable Website Donation Button

[HomelessPetHelp]

Hello,
We would like to have a button that allows the customer to donate an amount they choose. Presently the credit card company gives the following code for a $5 donation;

<a href="https://epay.propay.com/external/buy.aspx?d=s580KrUSFlwcSYDrz3z7MOD2B2dIRIjTk%2fudBUeA71tJGMOD2BzaU1VbQuLdpRo3fv7vWn9HkeReQINAleKFKIYHgv7lYdwiGMqsc2juMOhtthGYD9qi7zZ%2fUgbNdiS2G6M4NGj7&a=32918390" target="_blank"><img src="https://epay.propay.com/images/BuyButton/DonateNow.png" border="0" alt="Donate Now" title="Donate Now" /></a>

Nothing available for a user set donation from them. Homeless Pet Help is a 501c3 that gives out food and supplies to NYC pet owners in need. Thank you for reading this.

[Banfa]

Looking at that html I would guess that the account to pay and amount are both encoded into the data passed as variable d and a (actually I'd guess that a is the account number).

There is very little we can suggest because I imagine that the data contains a checksum, a way of verifying that the data hasn't been changed, so even if we could determine what to change, which we can't, the receiving website would detect the change and most likely reject the query.

Bottom line, if your service provider/credit card company don't provide the facility there is not much we can do (except find another more flexible provider)

[HomelessPetHelp]

Makes sense, thank you very much.