Add YOCO payment intergration into a current Codeigniter Project

I have a current codeigniter project PHP that has Razor Pay as its payment portal. This does not work in my country so I need to add the YOCO payment intergration into my current project. See www.yoco.co.za for intergration API details and documentation. I need this done urgently

also see : "https://www.yoco.com/za/pos-integrations/" for more details