I have an old client who wants to integrate one system on their WordPress website.

The company is fairly new called LYFSIZE which basically takes the picture of the users and provides them the exact size measurements for the apparels.

I was successfully able to achieve the steps provided in this file -

Now, LYFSIZE has sent me documentation on how to use their API on the WordPress site.

I have never used API with the WordPress site and I am completely clueless on the procedure. I tried to follow the steps and was able to reach the final steps.

However, I am not understanding how to put this on the subdomain to actually test it on the WP site. How to initialize the API? How to use the SDK files on the WP site?

I have got SDK Files, Demo API keys.

I know this is like asking for training but it would be really nice if someone could guide me little or otherwise I don't know what I would say to the client.