Debug Oracle ATG Plugin

We have a Oracle ATG shopping cart plugin that communicates with our api. one particular call is failing and we're not sure why. Original developer is m.i.a. and this is a time sensitive project with a deadline of monday 12:00 pm CST I believe the plugin is written in java or JSP. We can provide good documentation on the plugin's files and ssh connection. We need a developer who can identify and correct the problem with the effected API call in the plugin we have built for Oracle ATG by the deadline