Need Expert Paypal Recurring Payments Coder

We need a coder that has lots of experience with paypal recurring payments to look at our system to make sure that it is working properly. We had a coder write most of our payment system and it seems to work fine except that when trial days is set to zero. When it is, then there seems to be a bug that prevents it from working. Previous coder could not be located to correct the issue. Coder must be experience with paypal recurring and can start immediately to debug the issue and resolve it quickly.