SAP API Sandbox Authentication flow

Hey Everyone,

I'm new to the SAP Ecosystem and it's a bit overwhelming to start with.

I want to build a solution that consumes SAP APIs (specifically SuccessFactors APIs) for customers that use SF and build some Analytics and ML over it for my clients.

I don't have any access to an SAP Dashboard like CF or anything, but I do want to build from Curl a flow for authentication through the SAP API in order to receive a token. (i understand there are two types of auth, Basic and OAuth). can anyone please can explain to me how can I test against any sandbox an authentication flow for API Requests?