Changing parameters will be done using our APIs and will have two hooks involved, imagine you

want to change the Profit Rate on your product. In this situation, the pre_parameter_change_code will run and then once the parameter has been successfully

changed the post_parameter_change_code will autonomously run. Actions such as recalculating profit on an account could be done in the

post_parameter_change_code 

After a parameter change Perform optional hook directives