I have almost finished completion of my own payment gateway. The developer I've used has reached the limit of what he can do. I have 2 more jobs that require finishing before the site is complete.
1. Integration of 3rd party payment processor's accounts page.
2. Cancel link on final credit card payment page that allows client to cancel out of cc transaction and get taken back to the 'My Accounts' page on my site.
3. Automatic link back to 'My Accounts' page on my site, after decline/accept cc payment has been made.
Might be some other jobs that need tidying up but the above are my main issues at the moment.
This is urgent although I am working to a very tight budget. I'm told the job is easy for a programmer experienced in these matters. :-)