is tehre API, where to find documents

[help40]

Hello, and sorry if this is discussed , I did not find it searching the forum.
making own billing (I mean omegabill project) is good , but adapting existing billing systems to work with ispCPometa is important too.

may be many hosters do not want to use it just because all must be done by hand.

Please delete the topic if there is already discussion about API
(just let me know where to find it ...)
thank you in advance