My customer need new post processor or small changes for existing.
First of all, please try to apply one of free similar postprocessor from a list of the standard postprocessors.
If any change is necessary for the postprocessor - you can do it itself using Post Processor Generator in SprutCAM.
Online manual for Post Processor Generator is available: http://www.sprutcam.com/files/documentation/Inp/eng/index.html
FYI: Postprocessing tutorial section.
If you still need a help, please check the price for develop (new or tuning of existing) of the postprocessor in the agreement:
If customer will do prepay - we will need the programming manual, details which commands need for the post, examples of NC code, SprutCAM project with a part or example of part with any details also.
After that we will need ~1-3 weeks for first release and ~2-4 weeks for final release of the postprocessor.