Originally Posted by PBucksJohn

The NATS Gateway
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In order to allow for a totally seemless integration of NATS into your Sites we added the NATS Gateway to NATS v2. This was specifically setup for everyone that is right now using a Gateway with their own Merchant Account and would like to start using NATS but not have to change the join forms. The principle is very easy: instead of using your real Gateway for processing CC or Check transactions you now use the NATS Gateway instead. The NATS Gateway will then forward all processing to your Merchant Gateway(s) allowing for true behind-the-scenes cascading.
Theoretically the NATS Gateway can even be used with non-gateway billers. When the NATS Gateway encounters a non-gateway biller in the cascade, it will return an error with the URL you have to redirect the surfer to.
This is a highly advanced feature and should only be used by people that know exactly what they are doing. More information on the NATS Gateway can be found in the Too Much Media Knowledge Base.