If you want to use the Picqer API in your PHP app, you can use our PHP Client library.
The client library is available on Github.
This project can easily be installed through Composer and Packagist.
Some simple examples on how to use the PHP Client can be found in the examples folder in the package.
We also have some bigger example projects, that uses the Picqer PHP Client. Like an Excel importer and FTP syncer. You can review and use these projects from our Github page.