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?

A software development kit is a collection of software development tools in one installable package.

As such your last question doesn't make sense. The SDK installs your software development tools and your code would be where the API is called but not a call to the SDK!

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