Multiple DB record creation after a successful operation
My Suggestions are  


If this class is not going to be instantiated you can remove the
      initialize method and even make it a module      
Now you donot need to use instance variables , local variable passed via
params    work here
According to the book 'Object Oriented Design in Ruby - By Sandi Metz' a method need not know the order of
params and even    the
      ClassNames it is going to create objects from. Rather you can pass
      Hash of parameters and you can use like 


Advantage: You can pass params in any order

def maintain_records(param)  
  # set fallback/default params
  param.merge(default_params)
  customer, payment_details, response = param[:customer], param[:payment_details], param[:response]