Hello,
i'd like to offer you my Prestashop skills. I can duplicate and rename ps_checkpayment module for you.
----------------------------
I work daily with prestashop over 7 years. I know prestashop from top to bottom. I am familiar with every aspect of this eshop system. From adding simple features, theme modifications, creating custom prestashop modules to overriding core files and connecting prestashop to various API's.
You can also check my profile on freelancer.com where i have a lot of prestashop related reviews: https://www.freelancer.com/u/prestashop24.html
Thank you for your time.
Kind Regards,
Jarda Nalezny