Hello, I'm primarily a graphic designer with some intermediate php coding skills. I love everything about Processwire; how easy it is to get up and running, making a lot of things that are hard (at least to me), very easy to implement. In fact, it makes me look like a genius most of the time ( I deal with a lot of Imposter Syndrome, but anyways . . .). I'm trying to figure out how to install Square's SDK and API into a processwire site I'm developing for my wife. I've read a lot of tutorials and articles, and I'm afraid to make some horrible error that will break what I've already built (I just recently learned how to use Regions with confidence). I don't know if I should install Composer or not ( I don't understand Composer, do I install only locally on my computer, or actually have to install it on the server?) or do I just manually install the SDK on the server itself, but where? Not the root folder, I know that much and how do I call it in the files (in the config.php or in the _init.php). She's an esthetician, I'd like users to be able to book appointments on the site and her able to make those appointments to deposit a percentage to hold the appointment. So that is my issue. Would love some help and keep learning to get better with using Processwire.