[ic] Using paysystem with Interchange

[Lincoln Bertram]

Did anyone respond to the query about paysystems process for 
Interchange.  I would be interested in using it, if it were available.

Also, I am interested in looking at the documentation that Cameron 
offered.  If I do not get a reasonable about of documentation on using 
paysystem with Interchange, I will go with Echo instead.

At this point it is not clear to me which one is better?