API integration

4 1 2

Hello Everybody. Lately i've been  having a problem, that problem is that in my country we don't have gateways that accept international credit cards, after doing some research I found a company. I have created an account and requested them the service that i needed which was an API that would allow me to accept payments and accept them in my website, the problem is I don't know how to install it, they sent me an manual on how to integrate it, this is the manual https://developercielo.github.io/en/manual/cielo-ecommerce , could somebody please help me.