Need a script repaired

I have installed a Doubler script and most of
it is working fine but I am having a few problems
when members pay and joi.

I need someone to look at the script and figure
out what the problems are and fix them.

Please give me an estimate of cost

Thanks, this is urgent.

What purpose does a doubler script serve?

Btw, it's probably like the others I've seen and was coded by someone akin to a blind man, so just find one which actually works instead of trying to fix the first one you find. You can't polish a turd.