APIs and SDKs in a PHP project

I want to understand how I can add an SDK to my PHP projects to make APIs calls. I noticed that every software company have an SDK. I also noticed that most SDKs use Composer. I don't know what composer is and do I need to have it for every SDK?

I am also using PHP procedural programming and I noticed that these SDKs use OOP.

Can someone help me make my first API call using an SDK?

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