Converting Gateway Services to 1.5.0

I'm trying to convert:
http://www.zen-cart.com/downloads.php?do=file&id=921

to 1.5.0 and I'm really struggling, any one have any suggestions?
or can give me an idea what changed as far a credit card processing in 1.5.0?
or know of another mod that works with 1.5.0 for direct post api?

Here is a link to the direct post api.
https://docs.google.com/open?id=1rBv9ES3ng18HPNBTeGOxAHBDP0jQccyHZfAEuYYc0d5IgKOh4j15EJ93HiTk

any thoughts?

Thank you in advance!

Unfortunately that module was created for 1.3.8
Download all subsequent versions and in the docs there is a change log

Make a list of the files in the module and compare it to the change logs

If there has not been any changes to the files that the module uses then it is still applicable

ok, so much for a quick task :)
Thanks for a direction!
Once completed all update the plugin!

I got to the point I'm getting success, on processing. However I get a page on the gateways server that says:
response=1&responsetext=SUCCESS&authcode=123456&transactionid=1742080112&avsresponse=N&cvvresponse=&orderid=&type=auth&response_code=100&merchant_defined_field_6=&merchant_defined_field_7=&customer_vault_id=

how do i get back into zencart?

how do i get back into zencart?
I am not familiar with the USFSG Gateway but normally one sets the return in their account with them

I figured it out had to do a bit of modification, will put the final touches on it and post in the plugins when complete.