I've been struggling for 2 weeks now, trying to get the 'FastCharge' payment gateway to jive through the 'authorize.net' and the assocated PHP file.

I've changed the URLs in the php file to route to FastCharge, as I was instructed by their tutorials. First I had tried to do this through some of Wordpress's shopping cart plug-ins. But it would never properly process the transactions, no matter what I tried. The people who wrote the plugins were less than forthcoming with their help. FastCharge recommended that I move to Zencart, since there were other stores (we sell ammunition) who have done so, and done so successfully.

Your forums have been much more helpful so far, and I still have high hopes. But after doing all this, and porting our cart over to Zencart, I still can't get the payment gateway to work. When I reach the point where I confirm the order in the test transaction, it always says:

"The merchant login ID or password is invalid or the account is inactive. - Your credit card could not be authorized for this reason. Please correct the information and try again or contact us for further assistance."

Now, I know I've entered in all the info that the authorize.net plug-in asks for, including the login ID, and the transaction key. I've set the auth. type to 'authorize and capture', as instructed by FastCharge. I set the transaction mode to 'production', as also instructed. But whether I use our actual transaction key and login, or the test ones provided by fastcharge, the same error still crops up.

I'm at my wits end here. I'm sure it's something simple that I've overlooked. If anyone who has a Fastcharge account, and has gotten it to work over ZenCart through the authorize.net php could tell me how they did it, and what I might be doing wrong, I'll bless you. I'm prepared to donate to zencart if I can just get this LAST issue resolved to the point where our clients can see a functioning shopping cart with a working payment gateway....