Will this work with cartthrob if I simply set the gateway to Authorize.net with redfin credentials?
No. This means that we could pretty quickly convert the Authorize.net gateway to work with Redfin, because they accept parameters in the same way. In my experience it still takes a little effort to convert. If you’d like us to build a custom gateway to support Redfin, we can for a flat rate of $600 USD.
Generally it takes a few weeks to get the gateways done. Usually you have to get some docs and info together for us, we build pretty quick and then it might take some time to test. So we usually estimate about 2 to 3 weeks.