Integrate Nochex Payments With A Source Shopping Cart Named Shopbase -- 3

I would like to integrate nochex payments merchant with a closed source website made with Shopbase . Only take this job if you're positive you can finish it , I have contacted a lot of developers and they culdn't do it . Here's the documentation on adding a gateway on Shopbase :
- https://developers.shopbase.com/integrate-a-payment-gateway/how-to-create-your-payment-gateway
-https://developers.shopbase.com/integrate-a-payment-gateway/technical-specifications
here's their API documentation :
-https://api-doc.shopbase.com/#tag/Payment-Method