PHP API integration request into my HTML website

Hello good day and how are you doing I have a request and I don't know if that will be possible I would like to integrate your platform to work on my HTML site so that I can be able to have the shipping rates and track my orders of my customers so I don't know if you can be able to provide me with the PHP API.

I will be glad to get a swift response so I can get my site running, thank you and have a splendid day.