ENOM Reseller: How to use ENOM's Merchant Service?

[owndomain]

i.e. I only want to use ENOM's Credit Card Processing.

ENOM's webpage says it is possible, after you use RegistryRocket. And what you do is to use API included.

But where can I find the API?

I downloaded all the ZIP files for Perl, PHP or ASP, but cannot find any API handling credit card.

Any ideas?