Payment Module v1.3.x upgrade to v2.0.x

The company which handles our credit card payments only has a plugin for CS Cart v1.3.x (this isn’t working on v2.0.x)- is it difficult to update that code to work with v2.0.x? Is anyone willing to help me?



Thanks.



P.S. Please find attached payment gateway code

CSCart_PayGateZA_PayWebv2.zip